450 relations: Acanthamoeba, Acariasis, Actinomycosis, Acute (medicine), Acute necrotizing ulcerative gingivitis, Adenoviridae, Adrenal gland, African trypanosomiasis, Amoebiasis, Amoebic brain abscess, Amoebic liver abscess, Anaerobic organism, Ancylostomiasis, Angiostrongyliasis, Anisakis, Anthrax, Anus, Arenavirus, Argentine hemorrhagic fever, Arthropod, Ascariasis, Aspergillosis, Athlete's foot, Babesiosis, Bacillary dysentery, Bacillus, Bacteremia, Bacteria, Balantidiasis, Bartonellosis, Black piedra, Blastomycosis, Body louse, Bolivian hemorrhagic fever, Bone, Bornholm disease, Borrelia burgdorferi, Botulism, Boutonneuse fever, Brazilian purpuric fever, Brill–Zinsser disease, Brucellosis, Brugia malayi, Brugia timori, Bubonic plague, Burkitt's lymphoma, Buruli ulcer, Cachexia, California encephalitis virus, Campylobacter, ..., Cancer, Candida albicans, Candidiasis, Candiru, Capillariasis, Cardiovascular disease, Carrion's disease, Cat-scratch disease, Cellulitis, Central nervous system, Cestoda, Chagas disease, Chancre, Chancroid, Chickenpox, Chikungunya, Chlamydia infection, Chlamydia psittaci, Chlamydiae, Cholera, Chromoblastomycosis, Chronic condition, Clonorchiasis, Clostridium difficile infection, Clostridium perfringens, Coccidioidomycosis, Colitis, Colorado tick fever, Complication (medicine), Condylomata lata, Congenital syphilis, Conjunctivitis, Coronavirus, Cowpox, Coxsackievirus, Creutzfeldt–Jakob disease, Crimean–Congo hemorrhagic fever, Cryptococcosis, Cryptosporidiosis, Cutaneous amoebiasis, Cutaneous larva migrans, Cutaneous leishmaniasis, Cysticercosis, Cytomegalovirus, Demodex, Dengue fever, Dermanyssus gallinae, Dermatomycosis, Dermatophytosis, Dicrocoelium dendriticum, Dimorphic fungus, Diphtheria, Diphyllobothriasis, Dissemination, Dracunculiasis, Ear, Eastern equine encephalitis, Ebola virus disease, Echinococcosis, Echovirus, Eczema herpeticum, Enanthem, Encephalitis, Encephalitis lethargica, Encephalopathy, Enteritis, Enterocolitis, Enteroinvasive Escherichia coli, Enterotoxigenic Escherichia coli, Enterovirus, Entomophthoramycosis, Epidemic typhus, Erysipelas, Erysipeloid, Erythema chronicum migrans, Escherichia coli, Eumycetoma, Exanthem, Eye disease, Fasciolopsiasis, Fasciolosis, Fifth disease, Filariasis, Foodborne illness, Foot-and-mouth disease, Gapeworm, Gas gangrene, Gastroenteritis, Gastrointestinal tract, Genital wart, Genitourinary system, Geotrichosis, Giardiasis, Glanders, Gnathostomiasis, Gongylonema, Gram-negative bacteria, Granuloma inguinale, Group A streptococcal infection, Gumma (pathology), Haematopoiesis, Haemophilus influenzae, Hand, foot, and mouth disease, Haverhill fever, Head louse, Health care, Helminthiasis, Hematology, Hepatitis, Hepatitis A, Hepatitis B virus, Hepatitis C, Hepatitis E, Herpangina, Herpes simplex, Herpes simplex keratitis, Herpesviral encephalitis, Herpesviral meningitis, Herpesviridae, Histoplasmosis, HIV, HIV/AIDS, Hookworm infection, Human eye, Human musculoskeletal system, Human respiratory syncytial virus, Human skin, Hymenolepiasis, Hymenolepis nana, ICD-10, ICD-10 Chapter XII: Diseases of the skin and subcutaneous tissue, Immunology, Infection, Infectious mononucleosis, Infestation, Influenza, International Statistical Classification of Diseases and Related Health Problems, Isosporiasis, Japanese encephalitis, Joint, Kaposi's sarcoma, Kerion, Klebsiella pneumoniae, Kunjin virus, Kuru (disease), Kyasanur Forest disease, La Crosse encephalitis, Lassa fever, Late congenital syphilitic oculopathy, Leech, Legionnaires' disease, Leishmaniasis, Lentivirus, Leprosy, Leptospirosis, Lesion, Linguatulosis, Liponyssoides sanguineus, Listeriosis, Loa loa filariasis, Lobomycosis, Louping ill, Lyme disease, Lymphadenopathy, Lymphatic filariasis, Lymphatic system, Lymphocytic choriomeningitis, Lymphocytic interstitial pneumonia, Lymphogranuloma venereum, Malaria, Mansonelliasis, Marburg virus disease, Measles, Medical classification, Melioidosis, Meningitis, Meningococcal disease, Mesentery, Metastrongylus, Microsporidiosis, Miliary tuberculosis, Molluscum contagiosum, Moniliformis, Monkeypox, Mosquito, Mucocutaneous zone, Mucormycosis, Mucous membrane, Mumps, Murray Valley encephalitis virus, Mycobacterium, Mycobacterium avium complex, Mycobacterium avium-intracellulare infection, Mycobacterium kansasii, Mycobacterium marinum, Mycobacterium ulcerans, Mycoplasma, Mycoplasma pneumoniae, Mycosis, Myiasis, Naegleriasis, Nail (anatomy), Necatoriasis, Neisseria gonorrhoeae, Neisseria meningitidis, Neorickettsia, Nervous system, Neurosyphilis, Nocardiosis, Noma (disease), Non-Hodgkin lymphoma, Nontuberculous mycobacteria, Nonvenereal endemic syphilis, North Asian tick typhus, O'nyong'nyong virus, Omsk hemorrhagic fever, Onchocerciasis, Oncovirus, Onychomycosis, Opisthorchiasis, Oral candidiasis, Orf (disease), Organ (anatomy), Orientia, Oropouche fever, Orthopoxvirus, Papillomaviridae, Pappataci fever, Paracoccidioidomycosis, Paragonimiasis, Parasitic disease, Parasitism, Parasitology, Paratyphoid fever, Parvovirus, Pasteurellosis, Pathogenic bacteria, Pediculosis, Pediculosis pubis, Penicilliosis, Perineum, Peritoneum, Pharyngitis, Pharynx, Pinta (disease), Pinworm infection, Plague (disease), Plantar wart, Plasmodium falciparum, Plasmodium malariae, Plasmodium vivax, Pneumocystis pneumonia, Pneumocystosis, Pneumonia, Pneumonic plague, Poliomyelitis, Pontiac fever, Porocephaliasis, Powassan virus, Progressive multifocal leukoencephalopathy, Proteus (bacterium), Proteus mirabilis, Protozoa, Pseudallescheria boydii, Pseudocowpox, Pseudomonas, Psittacosis, Q fever, Queensland tick typhus, Rabies, Rat-bite fever, Rectum, Relapsing fever, Reoviridae, Retrovirus, Rhinopharyngitis mutilans, Rhinosporidiosis, Rickettsia, Rickettsia akari, Rickettsia australis, Rickettsia conorii, Rickettsia prowazekii, Rickettsia rickettsii, Rickettsia sibirica, Rickettsia typhi, Rickettsialpox, Rickettsiosis, Rift Valley fever, Rocky Mountain spotted fever, Roseola, Ross River fever, Rotavirus, Rubella, Saint Louis encephalitis, Salmonella, Salmonella enterica subsp. enterica, Sarcocystis, Scabies, Scarabiasis, Scarlet fever, Schistosoma haematobium, Schistosoma japonicum, Schistosoma mansoni, Schistosomiasis, Scrofuloderma, Scrub typhus, Sepsis, Septic shock, Sequela, Sex organ, Sexually transmitted infection, Shigatoxigenic and verotoxigenic Escherichia coli, Shigella boydii, Shigella dysenteriae, Shigella flexneri, Shigella sonnei, Shigellosis, Shingles, Skin, Smallpox, Sodoku, Sparganosis, Spirochaete, Sporotrichosis, Spotted fever, Staphylococcal infection, Staphylococcus, Staphylococcus aureus, Stomatitis, Streptococcus, Streptococcus agalactiae, Streptococcus pneumoniae, Strongyloidiasis, Subacute sclerosing panencephalitis, Subcutaneous tissue, Swimmer's itch, Sycosis, Syphilis, Tabes dorsalis, Taenia saginata, Taenia solium, Taeniasis, Tanapox, Tetanus, The International League of Dermatological Societies, Thelaziasis, Tick, Tick-borne encephalitis, Tinea barbae, Tinea capitis, Tinea corporis, Tinea cruris, Tinea imbricata, Tinea manuum, Tinea nigra, Tinea versicolor, Toxic shock syndrome, Toxoplasmosis, Trachoma, Transmissible spongiform encephalopathy, Trematoda, Trench fever, Trichinosis, Trichomoniasis, Trichostrongylus, Trichuriasis, Trombiculosis, Tuberculosis, Tuberculous meningitis, Tularemia, Tungiasis, Typhoid fever, Typhus, Vaccinia, Vagina, Venezuelan equine encephalitis virus, Vertigo, Vesicle (biology and chemistry), Viral disease, Viral encephalitis, Viral hemorrhagic fever, Viral hepatitis, Viral meningitis, Virus, Visceral larva migrans, Visceral leishmaniasis, Vulva, Wart, Waterhouse–Friderichsen syndrome, West Nile fever, Western equine encephalitis virus, White piedra, Whooping cough, World Health Organization, Wuchereria bancrofti, Yaws, Yellow fever, Yersinia enterocolitica, Zoonosis, Zygomycosis. 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Acanthamoeba is a genus of amoebae, a single-celled eukaryote commonly recovered from soil, fresh water and other habitats.
Acariasis is an infestation with mites.
Actinomycosis is a rare infectious bacterial disease caused by Actinomyces species.
In medicine, describing a disease as acute denotes that it is of short duration and, as a corollary of that, of recent onset.
Acute necrotizing ulcerative gingivitis (ANUG; colloquially known as trench mouth) is a common, non-contagious infection of the gums with sudden onset.
Adenoviruses (members of the family Adenoviridae) are medium-sized (90–100 nm), nonenveloped (without an outer lipid bilayer) viruses with an icosahedral nucleocapsid containing a double stranded DNA genome.
The adrenal glands (also known as suprarenal glands) are endocrine glands that produce a variety of hormones including adrenaline and the steroids aldosterone and cortisol.
African trypanosomiasis, also known as sleeping sickness, is an insect-borne parasitic disease of humans and other animals.
Amoebiasis, also known amoebic dysentery, is an infection caused by any of the amoebae of the Entamoeba group.
An amoebic brain abscess is a brain abscess caused by amoebas.
A amoebic liver abscess is a type of liver abscess caused by amebiasis.
An anaerobic organism or anaerobe is any organism that does not require oxygen for growth.
Ancylostomiasis (also anchylostomiasis or ankylostomiasis) is a hookworm disease caused by infection with Ancylostoma hookworms.
Angiostrongyliasis is a zoonotic infection by a nematode from the kidney and alimentary tract roundworm genus Angiostrongylus.
Anisakis is a genus of parasitic nematodes which have lifecycles involving fish and marine mammals.
Anthrax is an infection caused by the bacterium Bacillus anthracis.
The anus (from Latin anus meaning "ring", "circle") is an opening at the opposite end of an animal's digestive tract from the mouth.
An arenavirus is a virus which is a member of the family Arenaviridae.
Argentine hemorrhagic fever (AHF) or O'Higgins disease, also known in Argentina as mal de los rastrojos, stubble disease, is a hemorrhagic fever and zoonotic infectious disease occurring in Argentina.
An arthropod (from Greek ἄρθρον arthron, "joint" and πούς pous, "foot") is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and paired jointed appendages.
Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides.
Aspergillosis is the name given to a wide variety of diseases caused by infection by fungi of the genus Aspergillus.
Athlete's foot, known medically as tinea pedis, is a common skin infection of the feet caused by fungus.
Babesiosis is a malaria-like parasitic disease caused by infection with Babesia, a genus of Apicomplexa.
Bacillary dysentery is a type of dysentery, and is a severe form of shigellosis.
Bacillus is a genus of gram-positive, rod-shaped bacteria and a member of the phylum Firmicutes.
Bacteremia (also bacteraemia) is the presence of bacteria in the blood.
Bacteria (common noun bacteria, singular bacterium) is a type of biological cell.
Balantidiasis is a protozoan infection caused by infection with Balantidium coli.
Bartonellosis is an infectious disease produced by bacteria of the genus Bartonella.
Black piedra is a form of piedra caused by Piedraia hortae.
Blastomycosis (also known as "North American blastomycosis", "blastomycetic dermatitis", and "Gilchrist's disease") is a fungal infection of humans and other animals, notably dogs and occasionally cats, caused by the organism Blastomyces dermatitidis.
The body louse (Pediculus humanus humanus, sometimes called Pediculus humanus corporis) is a louse that infests humans.
Bolivian hemorrhagic fever (BHF), also known as black typhus or Ordog Fever, is a hemorrhagic fever and zoonotic infectious disease originating in Bolivia after infection by Machupo virus.
A bone is a rigid organ that constitutes part of the vertebrate skeleton.
Bornholm disease or epidemic pleurodynia or epidemic myalgia is a disease caused by the Coxsackie B virus or other viruses.
Borrelia burgdorferi is a bacterial species of the spirochete class of the genus Borrelia.
Botulism is a rare and potentially fatal illness caused by a toxin produced by the bacterium Clostridium botulinum.
Boutonneuse fever (also called Mediterranean spotted fever, fièvre boutonneuse, Kenya tick typhus, Indian tick typhus, Marseilles fever, or African tick-bite fever, or Astrakhan Fever) is a fever as a result of a rickettsial infection caused by the bacterium Rickettsia conorii and transmitted by the dog tick Rhipicephalus sanguineus.
Brazilian purpuric fever (BPF) is an illness of children caused by the bacterium ''Haemophilus influenzae'' biogroup aegyptius which is ultimately fatal due to sepsis.
Brill–Zinser disease is a delayed relapse of epidemic typhus, caused by Rickettsia prowazekii.
Brucellosis is a highly contagious zoonosis caused by ingestion of unpasteurized milk or undercooked meat from infected animals, or close contact with their secretions.
Brugia malayi is a nematode (roundworm), one of the three causative agents of lymphatic filariasis in humans.
Brugia timori is a human filarial parasitic nematode (roundworm) which causes the disease "Timor filariasis." While this disease was first described in 1965, the identity of Brugia timori as the causative agent was not known until 1977.
Bubonic plague is one of three types of plague caused by bacterium Yersinia pestis.
Burkitt lymphoma is a cancer of the lymphatic system, particularly B lymphocytes found in the germinal center.
Buruli ulcer is an infectious disease caused by Mycobacterium ulcerans.
Cachexia, or wasting syndrome, is loss of weight, muscle atrophy, fatigue, weakness and significant loss of appetite in someone who is not actively trying to lose weight.
California encephalitis virus was discovered in Kern County, California and causes encephalitis in humans.
Campylobacter (meaning "curved bacteria") is a genus of Gram-negative bacteria.
Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body.
Candida albicans is an opportunistic pathogenic yeast that is a common member of the human gut flora.
Candidiasis is a fungal infection due to any type of Candida (a type of yeast).
Candiru (Vandellia cirrhosa), also known as cañero, toothpick fish, or vampire fish, is a species of parasitic freshwater catfish in the family Trichomycteridae native to the Amazon Basin where it is found in the countries of Bolivia, Brazil, Colombia, Ecuador and Peru.
Capillariasis is a disease caused by nematodes in the genus Capillaria.
Cardiovascular disease (CVD) is a class of diseases that involve the heart or blood vessels.
Oroya fever or Carrion's disease is an infectious disease produced by Bartonella bacilliformis infection.
Cat-scratch disease (CSD) is a common and usually benign infectious disease caused by the bacterium Bartonella henselae.
Cellulitis is a bacterial infection involving the inner layers of the skin.
The central nervous system (CNS) is the part of the nervous system consisting of the brain and spinal cord.
Cestoda is a class of parasitic worms in the flatworm (Platyhelminthes) phylum, commonly known as tapeworms.
Chagas disease, also known as American trypanosomiasis, is a tropical parasitic disease caused by the protist Trypanosoma cruzi.
A chancre thefreedictionary is a painless genital ulcer most commonly formed during the primary stage of syphilis.
Chancroid (also known as soft chancre and ulcus molle) is a bacterial sexually transmitted infection characterized by painful sores on the genitalia.
Chickenpox, also known as varicella, is a highly contagious disease caused by the initial infection with varicella zoster virus (VZV).
Chikungunya is an infection caused by the chikungunya virus (CHIKV).
Chlamydia infection, often simply known as chlamydia, is a sexually transmitted infection caused by the bacterium Chlamydia trachomatis.
Chlamydia psittaci is a lethal intracellular bacterial species that may cause endemic avian chlamydiosis, epizootic outbreaks in mammals, and respiratory psittacosis in humans.
The Chlamydiae are bacterial phylum and class whose members are a group of obligate intracellular bacteria, whose members are remarkably diverse, ranging from pathogens of humans and animals to symbionts of ubiquitous protozoa.
Cholera is an infection of the small intestine by some strains of the bacterium Vibrio cholerae.
Chromoblastomycosis (also known as chromomycosis, cladosporiosis, Fonseca's disease, Pedroso's disease, phaeosporotrichosis, or verrucous dermatitis) is a long-term fungal infection of the skin and subcutaneous tissue (a chronic subcutaneous mycosis).
A chronic condition is a human health condition or disease that is persistent or otherwise long-lasting in its effects or a disease that comes with time.
Clonorchiasis is an infectious disease caused by the Chinese liver fluke, Clonorchis sinensis, and two related species.
Clostridium difficile infection (CDI or C-dif) is a symptomatic infection due to the spore-forming bacterium, Clostridium difficile.
Clostridium perfringens (formerly known as C. welchii, or Bacillus welchii) is a Gram-positive, rod-shaped, anaerobic, spore-forming pathogenic bacterium of the genus Clostridium.
Coccidioidomycosis, commonly known as "cocci", "Valley fever", as well as "California fever", "desert rheumatism", and "San Joaquin Valley fever", is a mammalian fungal disease caused by Coccidioides immitis or Coccidioides posadasii.
Colitis is an inflammation of the colon.
Colorado tick fever (CTF) (also called mountain tick fever, American tick fever, and American mountain tick fever) is a viral infection (Coltivirus) transmitted from the bite of an infected Rocky Mountain wood tick (Dermacentor andersoni).
Complication, in medicine, is an unfavorable evolution or consequence of a disease, a health condition or a therapy.
Condylomata lata or condyloma latum, is a cutaneous condition characterized by wart-like lesions on the genitals.
Congenital syphilis is syphilis present in utero and at birth, and occurs when a child is born to a mother with syphilis.
Conjunctivitis, also known as pink eye, is inflammation of the outermost layer of the white part of the eye and the inner surface of the eyelid.
Coronaviruses are species of virus belonging to the subfamily Coronavirinae in the family Coronaviridae, in the order Nidovirales.
Cowpox is an infectious disease caused by the cowpox virus.
Coxsackievirus is a virus that belongs to a family of nonenveloped, linear, positive-sense single-stranded RNA viruses, Picornaviridae and the genus Enterovirus, which also includes poliovirus and echovirus.
Creutzfeldt–Jakob disease (CJD) is a universally fatal brain disorder.
Crimean–Congo hemorrhagic fever (CCHF) is a viral disease.
Cryptococcosis, also known as cryptococcal disease, is a potentially fatal fungal disease.
Cryptosporidiosis, also known as crypto, is a parasitic disease caused by Cryptosporidium, a genus of protozoan parasites in the phylum Apicomplexa.
Cutaneous amoebiasis refers to a form of amoebiasis that presents primarily in the skin.
Cutaneous larva migrans (abbreviated CLM) is a skin disease in humans, caused by the larvae of various nematode parasites of the hookworm family (Ancylostomatidae).
Cutaneous leishmaniasis (also known as oriental sore, tropical sore, chiclero ulcer, chiclero's ulcer or Aleppo boil) is the most common form of leishmaniasis affecting humans.
Cysticercosis is a tissue infection caused by the young form of the pork tapeworm.
Cytomegalovirus (CMV) (from the Greek cyto-, "cell", and megalo-, "large") is a genus of viruses in the order Herpesvirales, in the family Herpesviridae, in the subfamily Betaherpesvirinae.
Demodex is a genus of tiny mites that live in or near hair follicles of mammals.
Dengue fever is a mosquito-borne tropical disease caused by the dengue virus.
Dermanyssus gallinae (also known as the red mite, poultry mite, red poultry mite, roost mite and chicken mite) is an ectoparasite of poultry and has been implicated as a vector of several major pathogenic diseases.
A dermatomycosis is a skin disease caused by a fungus.
Dermatophytosis, also known as ringworm, is a fungal infection of the skin.
Dicrocoelium dendriticum, the lancet liver fluke, is a parasite fluke that tends to live in cattle or other grazing mammals.
Dimorphic fungi are fungi that can exist in the form of both mold and yeast.
Diphtheria is an infection caused by the bacterium Corynebacterium diphtheriae.
Diphyllobothriasis is the infection caused by tapeworms of the Diphyllobothrium genus, commonly Diphyllobothrium latum and Diphyllobothrium nihonkaiense.
To disseminate (from lat. disseminare "scattering seeds"), in the field of communication, means to broadcast a message to the public without direct feedback from the audience.
Dracunculiasis, also called Guinea-worm disease (GWD), is an infection by the Guinea worm.
The ear is the organ of hearing and, in mammals, balance.
Eastern equine encephalitis (EEE), commonly called Triple E or, sleeping sickness (not to be confused with Trypanosomiasis) is a zoonotic alphavirus and arbovirus present in North, Central and South America and the Caribbean.
Ebola virus disease (EVD), also known as Ebola hemorrhagic fever (EHF) or simply Ebola, is a viral hemorrhagic fever of humans and other primates caused by ebolaviruses.
Echinococcosis is a parasitic disease of tapeworms of the Echinococcus type.
An ECHO (enteric cytopathic human orphan) virus is a type of RNA virus that belongs to the species Enterovirus B, genus Enterovirus of the Picornaviridae family.
Eczema herpeticum is a rare but severe disseminated infection that generally occurs at sites of skin damage produced by, for example, atopic dermatitis, burns, long term usage of topical steroids or eczema.
Enanthem or enanthema is a rash (small spots) on the mucous membranes.
Encephalitis is inflammation of the brain.
Encephalitis lethargica is an atypical form of encephalitis.
Encephalopathy (from ἐγκέφαλος "brain" + πάθος "suffering") means any disorder or disease of the brain, especially chronic degenerative conditions.
Enteritis is inflammation of the small intestine.
Enterocolitis or coloenteritis is an inflammation of the digestive tract, involving enteritis of the small intestine and colitis of the colon.
Enteroinvasive Escherichia coli (EIEC) is a type of pathogenic bacteria whose infection causes a syndrome that is identical to shigellosis, with profuse diarrhea and high fever.
Enterotoxigenic Escherichia coli (ETEC) is a type of Escherichia coli and one of the leading bacterial causes of diarrhea in the developing world, as well as the most common cause of travelers' diarrhea.
Enteroviruses are a genus of positive-sense single-stranded RNA viruses associated with several human and mammalian diseases.
Entomophthoramycosis (or Entomophthoromycosis) is a mycosis caused by Entomophthorales.
Epidemic typhus is a form of typhus so named because the disease often causes epidemics following wars and natural disasters.
Erysipelas is an acute infection typically with a skin rash, usually on any of the legs and toes, face, arms, and fingers.
In humans, Erysipelothrix rhusiopathiae infections most commonly present in a mild cutaneous form known as erysipeloid or fish poisoning.
Erythema chronicum migrans (New Latin, literally, "chronic migrating redness") refers to a rash often seen in the early stage of Lyme disease, and can also (but less commonly) be caused by southern tick-associated rash illness (STARI).
Escherichia coli (also known as E. coli) is a Gram-negative, facultatively anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms (endotherms).
Eumycetoma is a chronic granulomatous fungal disease of humans, affecting mainly the limbs, and sometimes the abdominal and chest walls or the head.
An exanthem or exanthema (from Greek ἐξάνθημα exánthēma, "a breaking out") is a widespread rash usually occurring in children.
This is a partial list of human eye diseases and disorders.
Fasciolopsiasis results from an infection by the trematode Fasciolopsis buski, the largest intestinal fluke of humans (up to 7.5 cm in length).
Fasciolosis is a parasitic worm infection caused by the common liver fluke Fasciola hepatica as well as by Fasciola gigantica.
Erythema infectiosum or fifth disease is one of several possible manifestations of infection by parvovirus B19.
Filariasis is a parasitic disease caused by an infection with roundworms of the Filarioidea type.
Foodborne illness (also foodborne disease and colloquially referred to as food poisoning) is any illness resulting from the food spoilage of contaminated food, pathogenic bacteria, viruses, or parasites that contaminate food, as well as toxins such as poisonous mushrooms and various species of beans that have not been boiled for at least 10 minutes.
Foot-and-mouth disease or hoof-and-mouth disease (Aphthae epizooticae) is an infectious and sometimes fatal viral disease that affects cloven-hoofed animals, including domestic and wild bovids.
A gapeworm (Syngamus trachea), also known as a red worm and forked worm, is a parasitic nematode worm that infects the tracheas of certain birds.
Gas gangrene (also known as clostridial myonecrosis and myonecrosis) is a bacterial infection that produces gas in tissues in gangrene.
Gastroenteritis, also known as infectious diarrhea, is inflammation of the gastrointestinal tract -- the stomach and small intestine.
The gastrointestinal tract (digestive tract, digestional tract, GI tract, GIT, gut, or alimentary canal) is an organ system within humans and other animals which takes in food, digests it to extract and absorb energy and nutrients, and expels the remaining waste as feces.
Genital warts are a sexually transmitted infection caused by certain types of human papillomavirus (HPV).
The genitourinary system or urogenital system is the organ system of the reproductive organs and the urinary system.
Geotrichosis is a mycosis caused by Geotrichum candidum.
Giardiasis, popularly known as beaver fever, is a parasitic disease caused by Giardia lamblia.
Glanders (from Middle English glaundres or Old French glandres, both meaning glands; malleus, Rotz; also known as "equinia", "farcy", and "malleus") is an infectious disease that occurs primarily in horses, mules, and donkeys.
Gnathostomiasis (also known as larva migrans profundus) is the human infection caused by the nematode (roundworm) Gnathostoma spinigerum and/or Gnathostoma hispidum, which infects vertebrates.
Gongylonema is a genus of thread-like nematode that was described by Molin in 1857.
Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the gram-staining method of bacterial differentiation.
Granuloma inguinale (also known as donovanosis) is a bacterial disease caused by Klebsiella granulomatis (formerly known as Calymmatobacterium granulomatis) characterized by genital ulcers.
A group A streptococcal infection is an infection with group A streptococcus (GAS).
A gumma is a soft, non-cancerous growth resulting from the tertiary stage of syphilis.
Haematopoiesis (from Greek αἷμα, "blood" and ποιεῖν "to make"; also hematopoiesis in American English; sometimes also haemopoiesis or hemopoiesis) is the formation of blood cellular components.
Haemophilus influenzae (formerly called Pfeiffer's bacillus or Bacillus influenzae) is a Gram-negative, coccobacillary, facultatively anaerobic pathogenic bacterium belonging to the Pasteurellaceae family.
Hand, foot, and mouth disease (HFMD) is a common infection caused by a group of viruses.
Haverhill fever (or epidemic arthritic erythema) is a form of "rat-bite fever" caused by the bacterium Streptobacillus moniliformis, an organism common in rats and mice.
The head louse (Pediculus humanus capitis) is an obligate ectoparasite of humans that causes head lice infestation (pediculosis capitis).
Health care or healthcare is the maintenance or improvement of health via the prevention, diagnosis, and treatment of disease, illness, injury, and other physical and mental impairments in human beings.
Helminthiasis (plural helminthiases), also known as worm infection, is any macroparasitic disease of humans and other animals in which a part of the body is infected with parasitic worms, known as helminths.
Hematology, also spelled haematology, is the branch of medicine concerned with the study of the cause, prognosis, treatment, and prevention of diseases related to blood.
Hepatitis is inflammation of the liver tissue.
Hepatitis A is an infectious disease of the liver caused by the hepatitis A virus (HAV).
Hepatitis B virus, abbreviated HBV, is a double stranded DNA virus, a species of the genus Orthohepadnavirus, and a member of the Hepadnaviridae family of viruses.
Hepatitis C is an infectious disease caused by the hepatitis C virus (HCV) that primarily affects the liver.
Hepatitis E is a viral hepatitis (liver inflammation) caused by infection with a virus called hepatitis E virus.
Herpangina, also called mouth blisters, is a painful mouth infection caused by coxsackieviruses.
Herpes simplex is a viral disease caused by the herpes simplex virus.
Herpetic simplex keratitis, also known as herpetic keratoconjunctivitis and herpesviral keratitis, is a form of keratitis caused by recurrent herpes simplex virus (HSV) infection in the cornea.
Herpesviral encephalitis is encephalitis due to herpes simplex virus.
Herpesviral meningitis is meningitis associated with herpes simplex virus (HSV).
Herpesviridae is a large family of DNA viruses that cause diseases in animals, including humans.
Histoplasmosis (also known as "Cave disease", "Darling's disease", "Ohio valley disease", "reticuloendotheliosis", "spelunker's lung" and "caver's disease") is a disease caused by the fungus Histoplasma capsulatum.
The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and over time acquired immunodeficiency syndrome (AIDS).
Human immunodeficiency virus infection and acquired immune deficiency syndrome (HIV/AIDS) is a spectrum of conditions caused by infection with the human immunodeficiency virus (HIV).
Hookworm infection is an infection by a type of intestinal parasite in the roundworm group.
The human eye is an organ which reacts to light and pressure.
The human musculoskeletal system (also known as the locomotor system, and previously the activity system) is an organ system that gives humans the ability to move using their muscular and skeletal systems.
Human respiratory syncytial virus (HRSV) is a syncytial virus that causes respiratory tract infections.
The human skin is the outer covering of the body.
Hymenolepiasis is infestation by one of two species of tapeworm: Hymenolepis nana or H. diminuta.
Dwarf tapeworm (Hymenolepis nana, also known as Rodentolepis nana, Vampirolepis nana, Hymenolepis fraterna, and Taenia nana) is a cosmopolitan species though most common in temperate zones, and is one of the most common cestodes (a type of intestinal worm or helminth) infecting humans, especially children.
ICD-10 is the 10th revision of the International Statistical Classification of Diseases and Related Health Problems (ICD), a medical classification list by the World Health Organization (WHO).
ICD-10 is an international statistical classification used in health care and related industries.
Immunology is a branch of biology that covers the study of immune systems in all organisms.
Infection is the invasion of an organism's body tissues by disease-causing agents, their multiplication, and the reaction of host tissues to the infectious agents and the toxins they produce.
Infectious mononucleosis (IM, mono), also known as glandular fever, is an infection usually caused by the Epstein–Barr virus (EBV).
Infestation is the state of being invaded or overrun by pests or parasites.
Influenza, commonly known as "the flu", is an infectious disease caused by an influenza virus.
The International Classification of Diseases (ICD) is the international "standard diagnostic tool for epidemiology, health management and clinical purposes." Its full official name is International Statistical Classification of Diseases and Related Health Problems. The ICD is maintained by the World Health Organization (WHO), the directing and coordinating authority for health within the United Nations System.
Isosporiasis, also known as cystoisosporiasis, is a human intestinal disease caused by the parasite Isospora belli (now known as Cystoisospora belli).
Japanese encephalitis (JE) is an infection of the brain caused by the Japanese encephalitis virus (JEV).
A joint or articulation (or articular surface) is the connection made between bones in the body which link the skeletal system into a functional whole.
Kaposi's sarcoma (KS) is a type of cancer that can form masses in the skin, lymph nodes, or other organs.
Kerion is the result of the host's response to a fungal ringworm infection of the hair follicles of the scalp (occasionally the beard) that can be accompanied by secondary bacterial infection(s).
Klebsiella pneumoniae is a Gram-negative, non-motile, encapsulated, lactose-fermenting, facultative anaerobic, rod-shaped bacterium.
Kunjin virus (KUNV) is a zoonotic virus of the family Flaviviridae and the genus Flavivirus.
Kuru is a very rare, incurable neurodegenerative disorder that was formerly common among the Fore people of Papua New Guinea.
Kyasanur Forest disease (KFD) is a tick-borne viral hemorrhagic fever endemic to South Asia.
La Crosse encephalitis is an encephalitis caused by an arbovirus (the La Crosse virus) which has a mosquito vector (Ochlerotatus triseriatus synonym Aedes triseriatus).
Lassa fever, also known as Lassa hemorrhagic fever (LHF), is a type of viral hemorrhagic fever caused by the Lassa virus.
Late congenital syphilitic oculopathy is a disease of the eye, a manifestation of late congenital syphilis.
Leeches are segmented parasitic or predatory worm-like animals that belong to the phylum Annelida and comprise the subclass Hirudinea.
Legionnaires' disease is a form of atypical pneumonia caused by any type of Legionella bacteria.
Leishmaniasis is a disease caused by parasites of the Leishmania type.
Lentivirus (lente-, Latin for "slow") is a genus of retroviruses that cause chronic and deadly diseases characterized by long incubation periods, in the human and other mammalian species.
Leprosy, also known as Hansen's disease (HD), is a long-term infection by the bacterium Mycobacterium leprae or Mycobacterium lepromatosis.
Leptospirosis is an infection caused by corkscrew-shaped bacteria called Leptospira.
A lesion is any abnormal damage or change in the tissue of an organism, usually caused by disease or trauma.
Linguatulosis is a condition associated with the organism Linguatula serrata.
Liponyssoides sanguineus is a species of mite that infests the house mouse (Mus musculus).
Listeriosis is a bacterial infection most commonly caused by Listeria monocytogenes, although L. ivanovii and L. grayi have been reported in certain cases.
Loa loa filariasis is a skin and eye disease caused by the nematode worm Loa loa.
Lobomycosis also known as (Jorge) Lobo's disease or lacaziosis, is a blastomycosis, a fungal infection of the skin caused by Lacazia loboi (formerly named Loboa loboi), and discovered by Brazilian dermatologist Jorge Lobo.
Louping-ill (also known as Ovine Encephalomyelitis, Infectious Encephalomyelitis of Sheep, Trembling-ill) is an acute viral disease primarily of sheep that is characterized by a biphasic fever, depression, ataxia, muscular incoordination, tremors, posterior paralysis, coma, and death. Louping-ill is a tick-transmitted disease whose occurrence is closely related to the distribution of the primary vector, the sheep tick Ixodes ricinus. It also causes disease in red grouse, and can affect humans. The name 'louping-ill' is derived from an old Scottish word describing the effect of the disease in sheep whereby they 'loup' or spring into the air.
Lyme disease, also known as Lyme borreliosis, is an infectious disease caused by bacteria of the Borrelia type which is spread by ticks.
Lymphadenopathy or adenopathy is disease of the lymph nodes, in which they are abnormal in size, number, or consistency.
Lymphatic filariasis, also known as elephantiasis, is a human disease caused by parasitic worms known as filarial worms.
The lymphatic system is part of the vascular system and an important part of the immune system, comprising a network of lymphatic vessels that carry a clear fluid called lymph (from Latin, lympha meaning "water") directionally towards the heart.
Lymphocytic choriomeningitis (LCM) is a rodent-borne viral infectious disease that presents as aseptic meningitis, encephalitis or meningoencephalitis.
Lymphocytic interstitial pneumonia (also called lymphocytic interstitial pneumonitis or LIP) is a syndrome secondary to autoimmune and other lymphoproliferative disorders.
Lymphogranuloma venereum (LGV) (also known as "Climatic bubo", "Durand–Nicolas–Favre disease", "Poradenitis inguinale", and "Strumous bubo") is a sexually transmitted disease caused by the invasive serovars L1, L2, L2a or L3 of Chlamydia trachomatis.
Malaria is a mosquito-borne infectious disease affecting humans and other animals caused by parasitic protozoans (a group of single-celled microorganisms) belonging to the Plasmodium type.
Mansonelliasis (or mansonellosis) is the condition of infection by the nematode Mansonella.
Marburg virus disease (MVD; formerly Marburg hemorrhagic fever) is a severe illness of humans and non-human primates caused by either of the two marburgviruses, Marburg virus (MARV) and Ravn virus (RAVV).
Measles is a highly contagious infectious disease caused by the measles virus.
Medical classification, or medical coding, is the process of transforming descriptions of medical diagnoses and procedures into universal medical code numbers.
Melioidosis is an infectious disease caused by a Gram-negative bacterium, Burkholderia pseudomallei, found in soil and water.
Meningitis is an acute inflammation of the protective membranes covering the brain and spinal cord, known collectively as the meninges.
Meningococcal disease describes infections caused by the bacterium Neisseria meningitidis (also termed meningococcus).
The mesentery is a continuous set of tissues that attaches the intestines to the abdominal wall in humans and is formed by the double fold of peritoneum.
Metastrongylus is a genus of nematodes of the family Metastrongylidae, usually found as lungworms in pigs and sometimes causing parasitic bronchitis.
Microsporidiosis is an opportunistic intestinal infection that causes diarrhea and wasting in immunocompromised individuals (HIV, for example).
Miliary tuberculosis is a form of tuberculosis that is characterized by a wide dissemination into the human body and by the tiny size of the lesions (1–5 mm).
Molluscum contagiosum (MC), sometimes called water warts, is a viral infection of the skin that results in small, raised, pink lesions with a dimple in the center.
Moniliformis is a genus of parasitic worm, from the family Moniliformidae.
Monkeypox is an infectious disease caused by the monkeypox virus.
Mosquitoes are small, midge-like flies that constitute the family Culicidae.
A mucocutaneous zone, or mucocutaneous boundary, is a region of the body in which mucosa transitions to skin.
Mucormycosis is any fungal infection caused by fungi in the order Mucorales.
A mucous membrane or mucosa is a membrane that lines various cavities in the body and covers the surface of internal organs.
Mumps is a viral disease caused by the mumps virus.
Murray Valley encephalitis virus (MVEV) is a zoonotic flavivirus endemic to northern Australia and Papua New Guinea.
Mycobacterium is a genus of Actinobacteria, given its own family, the Mycobacteriaceae.
Mycobacterium avium complex is a group of mycobacteria comprising Mycobacterium intracellulare, Mycobacterium avium, and Mycobacterium chimaera that are commonly grouped together because they infect humans together; this group in turn is part of the group of nontuberculous mycobacteria.
Mycobacterium avium-intracellulare infection (MAI) is an atypical mycobacterial infection, i.e. one with nontuberculous mycobacteria or NTM, caused by ''Mycobacterium avium'' complex ("MAC"), which is made of three mycobacteria species, M. avium, M. intracellulare, and M. chimaera.
Mycobacterium kansasii is a bacterium in the Mycobacterium family.
Mycobacterium marinum (formerly M. balnei) is a free-living bacterium, which causes opportunistic infections in humans.
Mycobacterium ulcerans is a slow-growing mycobacterium that classically infects the skin and subcutaneous tissues, giving rise to indolent nonulcerated (nodules, plaques) and ulcerated lesions.
Mycoplasma is a genus of bacteria that lack a cell wall around their cell membrane.
Mycoplasma pneumoniae is a very small bacterium in the class Mollicutes.
Mycosis is a fungal infection of animals, including humans.
Myiasis is the parasitic infestation of the body of a live mammal by fly larvae (maggots) that grow inside the host while feeding on its tissue.
Naegleriasis (also known as primary amoebic meningoencephalitis) is an infection of the brain by the free-living unicellular Naegleria fowleri.
A nail is a horn-like envelope covering the tips of the fingers and toes in most primates and a few other mammals.
Necatoriasis is the condition of infection by Necator hookworms, such as Necator americanus.
Neisseria gonorrhoeae, also known as gonococcus (singular), or gonococci (plural) is a species of gram-negative diplococci bacteria isolated by Albert Neisser in 1879.
Neisseria meningitidis, often referred to as meningococcus, is a Gram-negative bacterium that can cause meningitis and other forms of meningococcal disease such as meningococcemia, a life-threatening sepsis.
Neorickettsia is a genus of bacteria.
The nervous system is the part of an animal that coordinates its actions by transmitting signals to and from different parts of its body.
Neurosyphilis is an infection of the brain or spinal cord caused by the spirochete Treponema pallidum.
Nocardiosis is an infectious disease affecting either the lungs (pulmonary nocardiosis) or the whole body (systemic nocardiosis).
Noma is a rapidly progressive, polymicrobial, often gangrenous infection of the mouth or genitals.
Non-Hodgkin lymphoma (NHL) is a group of blood cancers that includes all types of lymphoma except Hodgkin's lymphomas.
Nontuberculous mycobacteria (NTM), also known as environmental mycobacteria, atypical mycobacteria and mycobacteria other than tuberculosis (MOTT), are mycobacteria which do not cause tuberculosis or leprosy (also known as Hansen's disease).
Bejel, or endemic syphilis, is a chronic skin and tissue disease caused by infection by the endemicum subspecies of the spirochete Treponema pallidum.
North Asian tick typhus (or North Asian tick fever), also known as Siberian tick typhus, is a condition characterized by a maculopapular rash.
The o'nyong'nyong virus (ONNV) was first isolated by researchers at the Uganda Virus Research Institute in Entebbe, Uganda, during a large outbreak of a disease in 1959 that resembled dengue fever.
Omsk hemorrhagic fever is a viral hemorrhagic fever caused by a Flavivirus.
Onchocerciasis, also known as river blindness, is a disease caused by infection with the parasitic worm Onchocerca volvulus.
An oncovirus is a virus that can cause cancer.
Onychomycosis, also known as tinea unguium, is a fungal infection of the nail.
Opisthorchiasis is a parasitic disease caused by species in the genus Opisthorchis (specifically, Opisthorchis viverrini and Opisthorchis felineus).
Oral candidiasis, also known as oral thrush among other names, is candidiasis that occurs in the mouth.
Orf is an exanthemous disease caused by a parapox virus and occurring primarily in sheep and goats.
Organs are collections of tissues with similar functions.
Orientia is a genus of bacteria in family Rickettsiaceae.
Oropouche fever is a tropical viral infection transmitted by biting midges and mosquitoes from the blood of sloths to humans.
Orthopoxvirus is a genus of viruses in the family Poxviridae and subfamily Chordopoxvirinae.
Papillomaviridae is an ancient taxonomic family of non-enveloped DNA viruses, collectively known as papillomaviruses.
Pappataci fever (also known as Phlebotomus fever and, somewhat confusingly, sandfly fever and three-day fever) is a vector-borne febrile arboviral infection caused by three serotypes of Phlebovirus.
Paracoccidioidomycosis (PCM) (also known as "Brazilian blastomycosis", "South American blastomycosis", "Lutz-Splendore-de Almeida disease" and "paracoccidioidal granuloma") is a fungal infection caused by the fungus Paracoccidioides brasiliensis.
Paragonimiasis is a food-borne parasitic infection caused by the lung fluke, most commonly Paragonimus westermani.
A parasitic disease, also known as parasitosis, is an infectious disease caused or transmitted by a parasite.
In evolutionary biology, parasitism is a relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life.
Parasitology is the study of parasites, their hosts, and the relationship between them.
Paratyphoid fever, also known simply as paratyphoid, is a bacterial infection caused by one of the three types of Salmonella enterica.
Parvovirus is the common name applied to all the viruses in the Parvoviridae taxonomic family.
Pasteurellosis is an infection with a species of the bacterial genus Pasteurella, which is found in humans and other animals.
Pathogenic bacteria are bacteria that can cause disease.
Pediculosis is an infestation of lice (blood-feeding ectoparasitic insects of the order Phthiraptera).
Pediculosis pubis (also known as "crabs" and "pubic lice") is a disease caused by the pubic louse, Pthirus pubis, a parasitic insect notorious for infesting human pubic hair.
Penicilliosis (or penicillosis) is an infection caused by Penicillium marneffei.
The perineum is the space between the anus and scrotum in the male and between the anus and the vulva in the female.
The peritoneum is the serous membrane that forms the lining of the abdominal cavity or coelom in amniotes and some invertebrates, such as annelids.
Pharyngitis is inflammation of the back of the throat, known as the pharynx.
The pharynx (plural: pharynges) is the part of the throat that is behind the mouth and nasal cavity and above the esophagus and the larynx, or the tubes going down to the stomach and the lungs.
Pinta (also known as Azul, Carate, Empeines, Lota, Mal del Pinto and Tina) is a human skin disease endemic to Mexico, Central America, and South America caused by infection with the spirochete, Treponema carateum, which is morphologically and serologically indistinguishable from the bacterium that causes syphilis.
Pinworm infection, also known as enterobiasis, is a human parasitic disease caused by the pinworm.
Plague is an infectious disease caused by the bacterium Yersinia pestis.
A plantar wart is a wart occurring on the bottom of the foot or toes.
Plasmodium falciparum is a unicellular protozoan parasite of humans, and the deadliest species of Plasmodium that cause malaria in humans.
Plasmodium malariae is a parasitic protozoa that causes malaria in humans.
Plasmodium vivax is a protozoal parasite and a human pathogen.
Pneumocystis pneumonia (PCP) is a form of pneumonia that is caused by the yeast-like fungus Pneumocystis jirovecii.
Pneumocystosis is an infection by Pneumocystis jirovecii, that primarily occurs as a pulmonary infection AIDS patients, with extrapulmonary involvement being uncommon but, if occurring in the skin, presenting most often as nodular growths in the auditory canal.
Pneumonia is an inflammatory condition of the lung affecting primarily the small air sacs known as alveoli.
Pneumonic plague is a severe lung infection caused by the bacterium Yersinia pestis.
Poliomyelitis, often called polio or infantile paralysis, is an infectious disease caused by the poliovirus.
Pontiac fever is an acute, nonfatal respiratory disease caused by various species of Gram-negative bacteria in the genus Legionella.
Porocephaliasis is a condition associated with species in the closely related genera Porocephalus and Armillifer.
Powassan virus is a flavivirus transmitted by ticks, found in North America and in the Russian Far East.
Progressive multifocal leukoencephalopathy (PML) is a rare and usually fatal viral disease characterized by progressive damage (-pathy) or inflammation of the white matter (leuko-) of the brain (-encephalo-) at multiple locations (multifocal).
Proteus is a genus of Gram-negative Proteobacteria.
Proteus mirabilis is a Gram-negative, facultatively anaerobic, rod-shaped bacterium.
Protozoa (also protozoan, plural protozoans) is an informal term for single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris.
Pseudallescheria boydii is a species of fungus classified in the Ascomycota.
Pseudocowpox is a disease caused by Pseudocowpox virus, (also known as "Paravaccinia") a virus of the family Poxviridae and the genus Parapoxvirus.
Pseudomonas is a genus of Gram-negative, Gammaproteobacteria, belonging to the family Pseudomonadaceae and containing 191 validly described species.
Psittacosis—also known as parrot fever, and ornithosis—is a zoonotic infectious disease caused by a bacterium called Chlamydia psittaci and contracted from infected parrots, such as macaws, cockatiels and budgerigars, and pigeons, sparrows, ducks, hens, gulls and many other species of bird.
Q fever is a disease caused by infection with Coxiella burnetii, a bacterium that affects humans and other animals.
Queensland tick typhus (or Australian tick typhus or (Rickettsial) spotted fever) is a condition caused by a bacterium Rickettsia australis.
Rabies is a viral disease that causes inflammation of the brain in humans and other mammals.
Rat-bite fever is an acute, febrile human illness caused by bacteria transmitted by rodents, in most cases, which is passed from rodent to human by the rodent's urine or mucous secretions.
The rectum is the final straight portion of the large intestine in humans and some other mammals, and the gut in others.
Relapsing fever is a vector-borne disease caused by infection with certain bacteria in the genus Borrelia, which are transmitted through the bites of lice or soft-bodied ticks (genus Ornithodoros).
Reoviridae is a family of viruses.
A retrovirus is a single-stranded positive-sense RNA virus with a DNA intermediate and, as an obligate parasite, targets a host cell.
Rhinopharyngitis mutilans, also known as gangosa, is a destructive ulcerative condition that usually originates about the soft palate and spreads into the hard palate, nasopharynx, and nose, resulting in mutilating cicatrices, and outward to the face, eroding intervening bone, cartilage, and soft tissues.
Rhinosporidiosis is an infection caused by Rhinosporidium seeberi.
Rickettsia is a genus of nonmotile, Gram-negative, nonspore-forming, highly pleomorphic bacteria that can be present as cocci (0.1 μm in diameter), rods (1–4 μm long), or thread-like (10 μm long).
Rickettsia akari is a species of Rickettsia which causes rickettsialpox.
Rickettsia australis is a bacterium that causes a medical condition called Queensland tick typhus.
Rickettsia conorii is a Gram-negative, obligate intracellular bacterium of the genus Rickettsia that causes human disease called Boutonneuse fever, Mediterranean spotted fever, Israeli tick typhus, Astrakhan spotted fever, Kenya tick typhus, Indian tick typhus, or other names that designate the locality of occurrence while having distinct clinical features.
Rickettsia prowazekii is a species of gram-negative, alphaproteobacteria, obligate intracellular parasitic, aerobic Bacillus bacteria that is the etiologic agent of epidemic typhus, transmitted in the feces of lice.
Rickettsia rickettsii (abbreviated as R. rickettsii) is a gram-negative, intracellular, coccobacillus bacterium that is around 0.8 to 2.0 micrometers long.
Rickettsia sibirica is a species of Rickettsia.
Rickettsia typhi is a species of the genus Rickettsia; it is the causative agent of Murine typhus.
Rickettsialpox is a mite-borne infectious illness caused by bacteria of the genus Rickettsia (Rickettsia akari).
A rickettsiosis is a disease caused by intracellular bacteria.
Rift Valley fever (RVF) is a viral disease that can cause mild to severe symptoms.
Rocky Mountain spotted fever (RMSF), also known as blue disease, is the most lethal and most frequently reported rickettsial illness in the United States.
Roseola is an infectious disease caused by certain types of virus.
Ross River fever is a mosquito-borne infectious disease caused by infection with the Ross River virus.
Rotavirus is the most common cause of diarrhoeal disease among infants and young children.
Rubella, also known as German measles or three-day measles, is an infection caused by the rubella virus.
Saint Louis encephalitis is a disease caused by the mosquito borne Saint Louis encephalitis virus.
Salmonella is a genus of rod-shaped (bacillus) Gram-negative bacteria of the family Enterobacteriaceae.
Salmonella enterica subsp.
Sarcocystis is a genus of parasites, the majority of species infecting mammals, and some infecting reptiles and birds.
Scabies, also known as the seven-year itch, is a contagious skin infestation by the mite Sarcoptes scabiei.
Scarabiasis is a condition where beetles temporarily infest the digestive tract of humans.
Scarlet fever is a disease which can occur as a result of a group A ''streptococcus'' (group A strep) infection.
Schistosoma haematobium (urinary blood fluke) is species of digenetic trematode, belonging to a group (genus) of blood flukes (Schistosoma).
Schistosoma japonicum is an important parasite and one of the major infectious agents of schistosomiasis.This parasite has a very wide host range, infecting at least 31 species of wild mammals, including 9 carnivores, 16 rodents, one primate (Human), two insectivores and three artiodactyls and therefore it can be considered a true zoonosis.
A paired couple of ''Schistosoma mansoni''. Schistosoma mansoni is a water-borne parasite of humans, and belongs to the group of blood flukes (Schistosoma).
Schistosomiasis, also known as snail fever and bilharzia, is a disease caused by parasitic flatworms called schistosomes.
Scrofuloderma (also known as "Tuberculosis cutis colliquativa") is a skin condition caused by tuberculous involvement of the skin by direct extension, usually from underlying tuberculous lymphadenitis.
Scrub typhus or bush typhus is a form of typhus caused by the intracellular parasite Orientia tsutsugamushi, a Gram-negative α-proteobacterium of family Rickettsiaceae first isolated and identified in 1930 in Japan.
Sepsis is a life-threatening condition that arises when the body's response to infection causes injury to its own tissues and organs.
Septic shock is a serious medical condition that occurs when sepsis, which is organ injury or damage in response to infection, leads to dangerously low blood pressure and abnormalities in cellular metabolism.
A sequela (usually used in the plural, sequelae) is a pathological condition resulting from a disease, injury, therapy, or other trauma.
A sex organ (or reproductive organ) is any part of an animal's body that is involved in sexual reproduction.
Sexually transmitted infections (STI), also referred to as sexually transmitted diseases (STD) or venereal diseases (VD), are infections that are commonly spread by sexual activity, especially vaginal intercourse, anal sex and oral sex.
Shigatoxigenic Escherichia coli (STEC) and verotoxigenic E. coli (VTEC) are strains of the bacterium Escherichia coli that produce either Shiga toxin or Shiga-like toxin (verotoxin).
Shigella boydii is a Gram-negative bacterium of the genus Shigella.
Shigella dysenteriae is a species of the rod-shaped bacterial genus Shigella.
Shigella flexneri is a species of Gram-negative bacteria in the genus Shigella that can cause diarrhea in humans.
Shigella sonnei is a species of Shigella.
Shigellosis is a type of diarrhea caused by a bacterial infection with Shigella.
Shingles, also known as herpes zoster, is a viral disease characterized by a painful skin rash with blisters in a localized area.
Skin is the soft outer tissue covering vertebrates.
Smallpox was an infectious disease caused by one of two virus variants, Variola major and Variola minor.
Sodoku (鼠毒) is a bacterial zoonotic disease.
Sparganosis is a parasitic infection caused by the Diphyllobothrium or the plerocercoid larvae of the genus Spirometra including ''S. mansoni'', S. ranarum, S. mansonoides and S. erinacei.
A spirochaete or spirochete is a member of the phylum Spirochaetes, which contains distinctive diderm (double-membrane) bacteria, most of which have long, helically coiled (corkscrew-shaped or spiraled, hence the name) cells.
Sporotrichosis (also known as "rose gardener's disease") is a disease caused by the infection of the fungus Sporothrix schenckii.
A spotted fever is a type of tick-borne disease which presents on the skin.
A staphylococcus infection or staph infection is an infection caused by members of the Staphylococcus genus of bacteria.
Staphylococcus (from the σταφυλή, staphylē, "grape" and κόκκος, kókkos, "granule") is a genus of Gram-positive bacteria.
Staphylococcus aureus is a Gram-positive, round-shaped bacterium that is a member of the Firmicutes, and it is a member of the normal flora of the body, frequently found in the nose, respiratory tract, and on the skin.
Stomatitis is inflammation of the mouth and lips.
Streptococcus (term coined by Viennese surgeon Albert Theodor Billroth (1829-1894) from strepto- "twisted" + Modern Latin coccus "spherical bacterium," from Greek kokkos meaning "berry") is a genus of coccus (spherical) Gram-positive bacteria belonging to the phylum Firmicutes and the order Lactobacillales (lactic acid bacteria).
Streptococcus agalactiae (also known as group B streptococcus or GBS) is a gram-positive coccus (round bacterium) with a tendency to form chains (as reflected by the genus name Streptococcus).
Streptococcus pneumoniae, or pneumococcus, is a Gram-positive, alpha-hemolytic (under aerobic conditions) or beta-hemolytic (under anaerobic conditions), facultative anaerobic member of the genus Streptococcus.
Strongyloidiasis is a human parasitic disease caused by the nematode called Strongyloides stercoralis, or sometimes S. fülleborni which is a type of helminth.
Subacute sclerosing panencephalitis (SSPE) is a rare and chronic form of progressive brain inflammation caused by a persistent infection with measles virus (which can be a result of a mutation of the virus itself).
The subcutaneous tissue, also called the hypodermis, hypoderm, subcutis, or superficial fascia, is the lowermost layer of the integumentary system in vertebrates.
Swimmer’s itch or cercarial dermatitis, is a short-term immune reaction occurring in the skin of humans that have been infected by water-borne schistosomatidae.
Sycosis is an inflammation of hair follicles, especially of the beard area, citing: Dorland's Medical Dictionary for Health Consumers.
Syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum subspecies pallidum.
Tabes dorsalis, also known as syphilitic myelopathy, is a slow degeneration (specifically, demyelination) of the neural tracts primarily in the dorsal columns (posterior columns) of the spinal cord (the portion closest to the back of the body) & dorsal roots.
Taenia saginata (synonym Taeniarhynchus saginatus), commonly known as the beef tapeworm, is a zoonotic tapeworm belonging to the order Cyclophyllidea and genus ''Taenia''.
Taenia solium is the pork tapeworm belonging to cyclophyllid cestodes in the family Taeniidae.
Taeniasis is a parasitic disease due to infection with tapeworms belonging to the genus Taenia.
Tanapox (a virus from the genus Yatapoxvirus), was first seen among individuals in the flood plain of the Tana River in Kenya during two epidemics (1957 and 1962) of acute febrile illness accompanied by localized skin lesions.
Tetanus, also known as lockjaw, is an infection characterized by muscle spasms.
The International League of Dermatological Societies (ILDS) is a non-governmental organization that works closely with the World Health Organization.
Thelaziasis (occasionally spelled "thelaziosis") is the term for infestation with parasitic nematodes of the genus Thelazia.
Ticks are small arachnids, part of the order Parasitiformes.
Tick-borne encephalitis (TBE) is a viral infectious disease involving the central nervous system.
Tinea barbæ (also known as "Barber's itch," "Ringworm of the beard," and "Tinea sycosis") is a fungal infection of the hair.
Tinea capitis (also known as "herpes tonsurans", "ringworm of the hair", "ringworm of the scalp", "scalp ringworm", and "tinea tonsurans") is a cutaneous fungal infection (dermatophytosis) of the scalp.
Tinea corporis (also known as ringworm, tinea circinata, and tinea glabrosa) is a superficial fungal infection (dermatophytosis) of the arms and legs, especially on glabrous skin; however, it may occur on any part of the body.
Tinea cruris, also known as crotch itch, crotch rot, Dhobi itch, eczema marginatum, gym itch, jock itch, jock rot, scrot rot and ringworm of the groin is a dermatophyte fungal infection of the groin region in any sex, though more often seen in males.
Tinea imbricata (also known as "Tokelau" and in parts of Indonesia as “Kaskado”) is a superficial fungal infection of the skin limited to southwest Polynesia, Melanesia, Southeast Asia, India, and Central America.
Tinea manuum (or tinea manus) is a fungal infection of the hand.
Tinea nigra (also known as "superficial phaeohyphomycosis," and "Tinea nigra palmaris et plantaris") is a superficial fungal infection that causes dark brown to black painless patches on the palms of the hands and the soles of the feet.
Tinea versicolor is a condition characterized by a skin eruption on the trunk and proximal extremities.
Toxic shock syndrome (TSS) is a condition caused by bacterial toxins.
Toxoplasmosis is a parasitic disease caused by Toxoplasma gondii.
Trachoma is an infectious disease caused by bacterium Chlamydia trachomatis.
Transmissible spongiform encephalopathies (TSEs), also known as prion diseases, are a group of progressive, invariably fatal, conditions that affect the brain (encephalopathies) and nervous system of many animals, including humans.
Trematoda is a class within the phylum Platyhelminthes.
Trench fever (also known as "five-day fever", "quintan fever" (febris quintana in Latin), and "urban trench fever") is a moderately serious disease transmitted by body lice.
Trichinosis is a parasitic disease caused by roundworms of the Trichinella type.
Trichomoniasis (trich) is an infectious disease caused by the parasite Trichomonas vaginalis.
Trichostrongylus species are nematodes (round worms), which are ubiquitous among herbivores worldwide, including cattle, sheep, donkeys, goats, deer, and rabbits.
Trichuriasis, also known as whipworm infection, is an infection by the parasitic worm Trichuris trichiura (whipworm).
Trombiculosis, trombiculiasis, or trombiculidiasis is a rash caused by trombiculid mites which is often referred to as a chigger bite.
Tuberculosis (TB) is an infectious disease usually caused by the bacterium Mycobacterium tuberculosis (MTB).
Tuberculous meningitis is also known as TB meningitis or tubercular meningitis.
Tularemia, also known as rabbit fever, is an infectious disease caused by the bacterium Francisella tularensis.
Tungiasis (also known as nigua, pio and bicho de pie, or pique or sand flea disease) is an inflammatory skin disease caused by infection with the female ectoparasitic Tunga penetrans (also known as chigoe flea, jigger, nigua or sand flea), found in the tropical parts of Africa, the Caribbean, Central and South America, and India.
Typhoid fever, also known simply as typhoid, is a bacterial infection due to ''Salmonella'' typhi that causes symptoms.
Typhus, also known as typhus fever, is a group of infectious diseases that include epidemic typhus, scrub typhus and murine typhus.
Vaccinia virus (VACV or VV) is a large, complex, enveloped virus belonging to the poxvirus family.
In mammals, the vagina is the elastic, muscular part of the female genital tract.
Venezuelan equine encephalitis virus is a mosquito-borne viral pathogen that causes Venezuelan equine encephalitis or encephalomyelitis (VEE).
Vertigo is a symptom where a person feels as if they or the objects around them are moving when they are not.
In cell biology, a vesicle is a small structure within a cell, or extracellular, consisting of fluid enclosed by a lipid bilayer.
A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells.
Viral encephalitis is a type of encephalitis caused by a virus.
Viral hemorrhagic fevers (VHFs) are a diverse group of animal and human illnesses in which fever and hemorrhage are caused by a viral infection.
Viral hepatitis is liver inflammation due to a viral infection.
Viral meningitis, also known as aseptic meningitis, is a type of meningitis due to a viral infection.
A virus is a small infectious agent that replicates only inside the living cells of other organisms.
Visceral larva migrans (VLM) is a condition in humans caused by the migratory larvae of certain nematodes, humans being a dead-end host, and was first reported in 1952.
Visceral leishmaniasis (VL), also known as kala-azar, black fever, and Dumdum fever, is the most severe form of leishmaniasis and, without proper diagnosis and treatment, is associated with high fatality.
The vulva (wrapper, covering, plural vulvae or vulvas) consists of the external female sex organs.
Warts are typically small, rough, and hard growths that are similar in color to the rest of the skin.
Waterhouse–Friderichsen syndrome (WFS) is defined as adrenal gland failure due to bleeding into the adrenal glands, commonly caused by severe bacterial infection: Typically it is caused by Neisseria meningitidis.
West Nile fever is a viral infection typically spread by mosquitoes.
The Western equine encephalomyelitis virus is the causative agent of relatively uncommon viral disease Western equine encephalomyelitis (WEE).
White piedra (or tinea blanca) is a mycosis of the hair caused by several species of fungi in the genus Trichosporon.
Whooping cough (also known as pertussis or 100-day cough) is a highly contagious bacterial disease.
The World Health Organization (WHO; French: Organisation mondiale de la santé) is a specialized agency of the United Nations that is concerned with international public health.
Wuchereria bancrofti is a human parasitic roundworm that is the major cause of lymphatic filariasis.
Yaws is a tropical infection of the skin, bones and joints caused by the spirochete bacterium Treponema pallidum pertenue.
Yellow fever is a viral disease of typically short duration.
Yersinia enterocolitica is a Gram-negative bacillus-shaped bacterium, belonging to the family Enterobacteriaceae.
Zoonoses are infectious diseases that can be transmitted between animals and humans.
Zygomycosis is the broadest term to refer to infections caused by bread mold fungi of the zygomycota phylum.