A

• Acute bacterial rhinosinusitis- most common= Streptococcus pneumoniae (G+ coccus) and Haemophilus influenzae (G- pleomorphic rod)
• Acute hemorrhagic conjunctivitis (*) - Coxsackie A-24 virus (Picornavirus: Enterovirus), Enterovirus 70 (Picornavirus: Enterovirus)
• Acute hemorrhagic cystitis (*) - Adenovirus 11 and 21 (Adenovirus)
• Acute rhinosinusitis- respiratory viruses usually
• Acquired Immunodeficiency Sydrome (AIDS) - Human Immunodeficiency Virus (HIV-1 and HIV-2) (retrovirus)
• Acrodermatitis chronica atrophicans (ACA)- late skin manifestation of latent Lyme disease- Borrelia burgdorferi (Spirochetes)
• Adult T-cell Leukemia-Lymphoma (ATLL) - Human T-cell Leukemia viruses I or II (retrovirus)
• African Sleeping Sickness - Trypanosomiasis - African= Trypanosoma brucei rhodesiense, Trypanosoma brucei gambiense (tsetse fly-borne)
• Alveolar hydatid - Echinococcus multilocularis (larval cestode infection)
• Amebiasis - Entamoeba histolytica (protozoan parasite)
• Amebic meningoencephalitis- Naegleria fowleri, Acanthamoeba species, and Balamuthia mandrillaris (protozoan)
• Anthrax - Black Bane- Malignant pustule- Wool sorter's disease- Tanner's disease- Bacillus anthracis (G+ rod: sporulating: aerobic)
• Ascariasis - Roundworm infections - Ascaris lumbricoides (intestinal nematode)
• Aseptic meningitis (*)- Coxsackie B virus, Echovirus, Mumps virus, Coxsackie A virus, Polio virus, (5 most common) then Human Herpesvirus 1, Arboviruses, Lymphocytic choriomeningitis viruses (Arenavirus), Encephalomycarditis viruses, Louping Ill virus, Pseudolymphocytic meningitis virus, Hepatitis viruses, Adenoviruses, Rhinoviruses.
• Athlete's foot - Tinea pedis - Trichophyton spp., and Epidermophyton floccosum (fungi)
• Australian tick typhus- Australian Spotted Fever- Queensland Tick Typhus- Rickettsia australis, (G-; intracellular bacteria)
•  Avian Influenza- Bird Flu- Influenza virus A H5N1

B

• Babesiosis - Babesia microti (protozoan parasite; transmitted by deer tick)
• Bacillary angiomatosis - Bartonella henselae (pleomorphic G-)
• Bacterial vaginosis- Gardnerella vaginalis, Mycoplasma hominis and various anaerobic bacteria including Mobiluncus sp., and Prevotella sp.
• Balanitis- Candida albicans (yeast)- most common.
• Balantidiasis- Balantidium coli (flagellated protozoan)
• Bang's disease - Brucellosis - Brucella sp. (G- coccobacillus; zoonoses)
• Bartonellosis - Verruga peruana- Carrion's disease - Oroya fever - Bartonella bacilliformis (weak G- polymorphic) sandfly bites at elevations of 600 to 2800 meter in Peru, Ecuador and Colombia.
• Bay sore - Chiclero's ulcer - Leishmania leishmania mexicana (protozoan parasite) sandfly
• Baylisascaris infection - Racoon roundworm infection- Baylisascaris procyonis
• Beaver fever - giardiasis - Giardia lamblia
• Beef tapeworm - Taenia saginata
• Bejel - endemic syphilis - Treponema pallidum var. endemicum
• Biphasic meningoencephalitis- Central European tick-borne encephalitis- Czechoslovak tick-borne encephalitis- Diphasic milk fever-  Tick-borne encephalitis- Viral meningoencephalitis- Tick-borne encephalitis virus- Flaviviridae
• Bird Flu- Avian Influenza- Influenza virus A H5N1
• Black Bane- Anthrax- Malignant pustule- Wool sorter's disease- Tanner's disease- Bacillus anthracis (G+ rod: sporulating: aerobic)
• "Black death" (plague) - Yersinia pestis (G- rod: facultative-straight: zoonoses)
• Black piedra- Piedraia hortai (fungal infection of hair shaft)
• Blackwater Fever- Malaria- Plasmodium falciparum (sporozoan parasite)
• Blastomycosis- Chicago disease- Gilchrist’s disease- North American blastomycosis- Blastomyces dermatitidis (dimorphic fungus)
• Blennorrhea of the newborn- Chlamydia trachomatis
• Blepharitis- infestation of the eyelash follicle by a mite. This results in an allergic reaction which leads to an inflammatory
reaction and secondary infection with Staphylococcus aureus or Staphylococcus epidermidis.
• Boils - Staphylcoccus aureus (G+ coccus)
• Bornholm disease (pleurodynia) - Coxsackie B (Picornavirus: Enterovirus)
• Botulism - Clostridium botulinum (G+ rod: sporulating: anaerobic)
• Boutonneuse fever- Fievre boutonneuse- Tick typhus- Rickettsia conori (G- intracellular; tick-borne)
• Brazilian purpuric fever - Haemophilus aegyptius (G- rod: facultative-straight: respiratory pathogens)
• Break Bone fever- dandy fever- Dengue virus (Flaviviridae)
• Brill-Zinsser disease - recrudescent typhus - Rickettsia prowazekii (G- intracellular; flea-borne)
• Bronchiolitis (*) - Respiratory syncytial virus (Paramyxovirus), Parainfluenza virus (Paramyxovirus)
• Brucellosis - Brucella sp. (G- coccobacillus; zoonoses)
• Bullous impetigo- Staphylococcus aureus
• Buruli ulcers- Mycoburuli ulcers- Mycobacterium ulcerans
• Busse-Buschke disease- Cryptococcosis-  Torulosis- European blastomycosis- Cryptococcus neoformans (encapsulated yeast)

C

• California group encephalitis - California encephalitis virus, La Crosse virus, Jamestown Canyon, Snowshoe hare virus (Bunyavirus) mosquitoes
• Candidiasis- Candidosis- Moniliasis- infection of the mucous membranes (mouth, esophagus, vagina) caused by the yeast Candida albicans.
• Candidosis- Candidiasis- Moniliasis- infection of the mucous membranes (mouth, esophagus, vagina) caused by the yeast Candida albicans.
• Canefield fever- canicola fever- 7-day fever- Weil's disease - leptospirosis - nanukayami fever- Leptospira interrogans (spiral shaped bacteria)
• Canicola fever- 7-day fever- Weil's disease - leptospirosis - canefield fever- nanukayami fever- Leptospira interrogans (spiral shaped bacteria)
• Capillariasis - Capillaria philippinensis (intestinal nematode)
• Carate - Mal del pinto - Pinta - Treponema pallidum var. carateum
• Carbuncle -  Staphylcoccus aureus (G+ coccus)
• Carrion's disease - Bartonellosis - Oroya fever - Bartonella bacilliformis (weak G- polymorphic) sandfly bites at elevations of 600 to 2800 meter in Peru, Ecuador and Colombia.
• Cat Scratch fever - Cat Scratch Disease- Bartonella henselae (pleomorphic G-)
• Cave disease- Darling's Disease- spelunker’s disease- Histoplasmosis- Histoplasma capsulatum (dimorphic fungus)
• Central Asian hemorrhagic fever- Congo-Crimean hemorrhagic fever- Crimean-Congo hemorrhagic fever- Congo fever- Crimean-Congo hemorrhagic fever virus- Bunyavirus- Nairovirus
• Central European tick-borne encephalitis- Diphasic milk fever- Biphasic meningoencephalitis,  Czechoslovak tick-borne encephalitis, Tick-borne encephalitis, Viral meningoencephalitis, Tick-borne encephalitis virus- Flaviviridae
• Cervical cancer - human papilloma virus (Papovavirus)
• Chancroid - Haemophilus ducreyi (G- rod: facultative-straight: respiratory pathogens)
• Chicago disease- Blastomycosis- Gilchrist’s disease- North American blastomycosis- Blastomyces dermatitidis (dimorphic fungus)
• Chikungunya fever- Chikungunya virus- Togaviridae- Alphavirus
• Chagas disease - Trypanosomiasis - American= Trypanosoma cruzi (Triatomine bugs= kissing bug or assassin bugs)
• Chickenpox - Varicella-Zoster virus (VZV or Human herpes 3 virus)
• Chiclero's ulcer - Bay sore - Leishmania leishmania mexicana (protozoan parasite) sandfly
• Chlamydia - Chlamydiae trachomatis (Obligate intracellular)
• Chlamydial infection- Chlamydiae trachomatis (Obligate intracellular)
• Cholera - Vibrio cholerae (G- rods: facultative-curved: enteric pathogens)
• Chromoblastomycosis - Fonsecaea pedrosoi (fungus)
• Clap - Gonorrhea - Neisseria gonorrhoeae (G- cocci)
• Clonorchiasis - Liver fluke infection - Clonorchis sinensis (liver flukes)
• Coccidioidomycosis- San Joaquin Valley fever, desert rheumatism, Posada-Wernicke disease- Coccidioides immitis (dimorphic fungus).
• Coenurosis - Taenia spp.(larval cestode infection)
• Colorado tick fever - Colorado tick fever virus (Reovirus)
• Congo fever- Congo-Crimean hemorrhagic fever- Crimean-Congo hemorrhagic fever- Crimean-Congo hemorrhagic fever virus- Central Asian hemorrhagic fever- Bunyavirus- Nairovirus
• Congo hemorrhagic fever virus- Congo-Crimean hemorrhagic fever-Crimean- Congo fever- Crimean-Central Asian hemorrhagic fever- Bunyavirus- Nairovirus
• Congo-Crimean hemorrhagic fever- Crimean-Congo hemorrhagic fever- Congo fever- Crimean-Congo hemorrhagic fever virus- Central Asian hemorrhagic fever- Bunyavirus- Nairovirus
• Condyloma accuminata - Warts - Papilloma virus
• Condyloma lata - Treponema pallidum subsp. pallidum (spirochete) secondary syphilis
• Conjunctivitis (*) - Haemophilus aegyptius (G- rod: facultative-straight: respiratory pathogens), Chlamydiae trachomatis (Obligate intracellular)
• Cowpox - vaccinia virus (Poxvirus)
• Crabs - Pediculosis - lice
• Creutzfeldt-Jakob disease - prion (a protein)
• Crimean-Congo hemorrhagic fever- Congo fever- Congo-Crimean hemorrhagic fever- Crimean-Congo hemorrhagic fever virus- Central Asian hemorrhagic fever- Bunyavirus- Nairovirus
• Croup, infectious - parainfluenza viruses 1-3 (Paramyxovirus)
• Cryptococcosis- Busse-Buschke disease- Torulosis- European blastomycosis- Cryptococcus neoformans (encapsulated yeast)
• Cutaneous Larval Migrans - Ancylostoma braziliense (filariform larvae; parasite) and many other parasitic worms normally found in animals.
• Cyclosporiasis- Cyclospora cayetanensis
• Cysticercosis - Taenia solium (larval form of the cestode)
• Cystic hydatid - Echinococcus granulosus (larval cestode infection)
• Cystitis(*) - most common= Escherichia coli, others include  Klebsiella sp, Enterobacter sp., Serratia sp., Proteus sp., Providencia sp., Morganella sp., Pseudomonas aeruginosa, (the previous organisms are G- rods), Staphylococcus saprophyticus, Enterococcus sp., Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus agalactiae, (G+ cocci), and Candida albicans (yeast)
• Czechoslovak tick-borne encephalitis,- Central European tick-borne encephalitis- Diphasic milk fever- Biphasic meningoencephalitis, Tick-borne encephalitis, Viral meningoencephalitis, Tick-borne encephalitis virus- Flaviviridae

D

• Dacryocytitis- Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus pneumoniae
• Dandy fever- Break Bone fever- Dengue virus (Flaviviridae)
• Darling's Disease- cave disease- spelunker’s disease- Histoplasmosis- Histoplasma capsulatum (dimorphic fungus)
• Deer fly fever, tularemia, lemming fever, rabbit fever, O'Hara disease, Francis disease, Francisella tularensis (G- rods: facultative-straight: zoonoses)
• Dengue - Break Bone fever- dengue fever - dengue virus (Flavivirus)
• Desert rheumatism- Coccidioidomycosis- San Joaquin Valley fever- Posada-Wernicke disease- Coccidioides immitis (dimorphic fungus).
• "Devil's grip"(pleurodynia) - Coxsackie B (Picornavirus: Enterovirus)
• Diphasic milk fever- Biphasic meningoencephalitis, Central European tick-borne encephalitis, Czechoslovak tick-borne encephalitis, Tick-borne encephalitis, Viral meningoencephalitis, Tick-borne encephalitis virus- Flaviviridae
• Diphtheria - Corynebacterium diphtheriae (G+ rod: non-sporulating: non-filamentous)
• Disseminated Intravascular Coagulation(*) - most commonly Escherichia coli (G- rod)
• Dwarf tapeworm - Hymenolepis nana (intestinal cestode)
• Dog tapeworm - Diphylidium caninum (intestinal cestode)
• Donovanosis - Granuloma inguinale- Klebsiella granulomatis (G- rod; Donovan bodies)
• Dracontiasis - Guinea Worm - Dirofilaria medinensis (parasitic worm)
• Dracunculosis- Dracunculus medinensis (parasite; nematode; "Little dragon of Medina")
• Duke's disease- viral rash- Coxsackievirus or Echovirus
• Dum Dum Disease - Kala Azar - Visceral Leishmaniasis - Leishmania leishmania donovani, L. leishmania infantum, L. leishmania chagasi (protozoan parasite) sandfly
• Durand-Nicholas-Favre disease - Lymphogranuloma venereum (LGV) - Chlamydia trachomatis (intracellular G- bacteria; the L serotypes)

E

• Eastern equine encephalitis - EEE virus (Togavirus)
• Ebola hemorrhagic fever - Ebola virus (Filovirus)
• Ectothrix - fungal infection of the hair shaft - Microsporum, Trichophyton, and Epidermophyton (fungi)
• Ehrlichiosis - Ehrlichia sp. (G- intracellular bacteria) transmitted by ticks
• Epidemic typhus- Rickettsia prowazekii, (G- intracellular; spread by lice)
• Encephalitis- Mumpsvirus, Human Herpesvirus 1 (Herpes Simplex 1 Virus), Any of 350 different arboviruses,            Enteroviruses (polio, Coxsackie, ECHO), Adenovirus, Human Immunodeficiency Virus
• Endemic Relapsing fever- Borrelia sp.
• Endemic syphilis -Bejel - Treponema pallidum var. endemicum
• Endophthalmitis- Staphylococcus aureus, Staphylococcus epidermidis, Bacillus cereus, Streptococcus pneumoniae, Streptococcus pyogenes.
• Endothrix - fungal infection of the hair shaft - Microsporum, Trichophyton, and Epidermophyton (fungi)
• Enterobiasis - Pinworm infection - Enterobius vermicularis (intestinal nematode)
• Epidemic Relapsing fever- Borrelia recurrentis
• Epiglottitis (*)- Haemophilus influenzae (G- rod: facultative-straight: respiratory pathogens
• Erysipeloid - Erysipelothricosis - Erysipelothrix rhusiopathiae (G+ rod)
• Erysipelis- Streptococcus pyogenes
• Erythema chronicum migrans - seen in Lyme disease
• Erythema marginatum - seen in rheumatic fever
• Erythema multiforme - seen in coccidioidomycosis (Coccidioides immitis)
• Erythema nodosum - seen in coccidioidomycosis (Coccidioides immitis)
• Erythema nodosum leprosum - Mycobacterium leprae
• Erythema infectiosum - (Slapped cheek syndrome; fifth disease) Parvovirus B19 (Parvovirus)
• Erythrasma - Corynebacterium minutissimum
• Espundia - Leishmania viannia braziliensis (protozoan parasite) sandfly
• Eumycotic mycetoma- Madura foot- Pseudallescheria boydii, Madurella grisea,Madurella mycetomatis (fungi)
• European blastomycosis- Torulosis- Busse-Buschke disease- Cryptococcosis- Cryptococcus neoformans (encapsulated yeast)
• Eyeworm - Loiasis - Loa loa (parasitic worm)
• Exanthem subitum - Roseola infantum - Sixth disease - Zahorsky's disease- "Sudden Rash", Rose rash of infants, 3-day fever- Human Herpes virus 6 (HHV-6)

F

• Far Eastern tick-borne encephalitis- Spring-summer encephalitis- Russian spring-summer encephalitis- Taiga encephalitis- Russian spring-summer encephalitis virus- Flaviviridae
• Fascioliasis - Liver fluke infection - Fasciola hepatica (liver flukes)
• Fievre boutonneuse- Tick typhus-  Rickettsia conori
• "Fifth" disease (erythema infectiosum) - Parvovirus B19 (Parvovirus)
• Filatow-Dukes' Disease- Scalded Skin Syndrome- Ritter's Disease- Staphylococcus aureus- (exfoliative toxin producing strains)
• Fish tapeworm - Diphyllobothrium latum
• Fitz-Hugh-Curtis syndrome - Perihepatitis - Neisseria gonorrhoeae (G- cocci)
• Five-day fever, Trench fever, Shinbone fever, Wolhynia fever, Quintana fever, His-Werner disease- Bartonella quintana (G- rod)
• Flinders Island Spotted Fever- Rickettsia honei
• Flu- Influenza - Influenza viruses A, B, and C (Orthomyxovirus)
• Four Corners Disease - Human Pulmonary Syndrome (HPS) - Sin Nombre Virus (Hantaan virus group; Bunyavirus)
• 14-day measles- Rubeola-measles- Morbilli- Hard measles- Rubeola virus
• Frambesia - Yaws -Treponema pallidum var. pertenue
• Francis disease, O'Hara disease, deer fly fever, lemming fever, tularemia, rabbit fever, Francisella tularensis (G- rods: facultative-straight: zoonoses)
• Furunculosis = boil- furuncle-  Staphylcoccus aureus (G+ coccus)
• Folliculitis - Staphylcoccus aureus (G+ coccus)

G

• Gas gangrene - Clostridium perfringens (G+ rod: sporulating: anaerobic)
• Gastroenteritis - Norwalk virus (Calicivirus), rotavirus (Reovirus)
• Genital Herpes- Herpes Simplex Virus-2 (Human Herpes Virus-2) occasionally HSV-1 (HHV-1)
• Genital Warts- Human Papilloma virus (various serotypes)
• German measles- Rubella- 3-day measles- Rubella virus
• Gerstmann-Straussler-Scheinker (GSS) - - prion (a protein)
• Giardiasis - Giardia lamblia
• Gilchrist’s disease- Chicago disease- Blastomycosis- North American blastomycosis- Blastomyces dermatitidis (dimorphic fungus)
• Gingivostomatitis - HSV-1 (Herpesvirus)
• Gingivitis- various anaerobic bacteria in the mouth
• Glanders - Burkholderia mallei (used to be named Pseudomonas mallei; G- rod)
• Gnathostomiasis- Gnathostoma spinigerum (third stage larvae of a nematode (parasitic worm))
• Gonorrhea - Neisseria gonorrhoeae (G- cocci)
• Granuloma inguinale - Donovanosis- Klebsiella granulomatis (G- rod)
• Guinea Worm - Dracontiasis - Dirofilaria medinensis (parasitic worm)

H

• Hamburger disease- Hemolytic Uremic Syndrome- Escherichia coli O157 H7 strain.
• Hand-foot-mouth disease - Coxsackie A-16 virus (Picornavirus: Enterovirus)
• Hansen's disease - leprosy- Mycobacterium leprae (Acid-fast positive)
• Hantaan-Korean hemorrhagic fever - Hantavirus (Bunyavirus)
• Hantavirus Pulmonary Syndrome (HPS) - Hantavirus (Bunyavirus)
• Hard chancre - syphilis - Treponema pallidum subsp. pallidum
• Hard measles- Rubeola- measles- 14-day measles - Morbilli- Rubeola virus
• Haverhill fever - Rat bite fever - Streptobacillus moniliformis (G-; rod)
• Helicobacterosis - duodenal ulcers - Helicobacter pylori (G- curved rod)
• Hemolytic Uremic Syndrome- Hamburger disease- Escherichia coli O157 H7 strain.
• Hepatitis A - hepatitis A virus (Picornavirus: Enterovirus)
• Hepatitis B - hepatitis B virus (Hepadnavirus)
• Hepatitis C - hepatitis C virus (Flavivirus)
• Hepatitis D - hepatitis D virus (Deltavirus)
• Hepatitis E - hepatitis E virus (Calicivirus)
• Herpangina (*) - Coxsackie A (Picornavirus: Enterovirus), Enterovirus 7 (Picornavirus: Enterovirus)
• Herpes, genital - HSV-2 (Herpesvirus)
• Herpes labialis - HSV-1 (Herpesvirus)
• Herpes, neonatal - HSV-2 (Herpesvirus)
• Hidradenitis - Staphylcoccus aureus (G+ coccus)
• HIV - human immunodeficiency virus (Retrovirus)
• Histoplasmosis - Histoplasma capsulatum (dimorphic fungus)
• His-Werner disease, Quintana fever, 5-day fever, Trench fever, Shinbone fever, Wolhynia fever- Bartonella quintana (G- rod)
• Hookworm infections - Ancylostoma duodenale, Necator americanus (intestinal nematode)
• Hordeola- Stye- Staphylococcus aureus
• HTLV- associated myelopathy (HAM) - Human T-cell Leukemia viruses I or II (retrovirus)
• Human Pulmonary Syndrome (HPS) - Four Corners Disease - Sin Nombre Virus (Hantaan virus group; Bunyavirus)
• Human monocytic ehrlichiosis - Ehrlichia chaffeensis. (G- intracellular bacteria) transmitted by ticks
• Human granulocytic ehrlichiosis - Ehrlichia equi. (G- intracellular bacteria) transmitted by ticks
• Hydatid cyst  - Echinococcus granulosus, Echinococcus multilocularis, Echinococcus vogeli (larval cestode infection)
• Hydrophobia - Rabies - Rabies virus (Rhabdovirus)

I

• Impetigo- Streptococcus pyogenes, Staphylococcus aureus
• Inclusion conjunctivitis - Swimming Pool conjunctivitis- Pannus - Chlamydia trachomatis (G- intracellular) eye infection
• Infantile diarrhea- Escherichia coli (ETEC- enterotoxigenic E. coli)
• Infectious Mononucleosis - Epstein-Barr virus (Herpesvirus; HHV-4)
• Infectious myocarditis (*) - Coxsackie B1-B5 (Picornavirus: Enterovirus)
• Infectious pericarditis (*)- Coxsackie B1-B5 (Picornavirus: Enterovirus)
• Influenza- Flu - Influenza viruses A, B, and C (Orthomyxovirus)
• Israeli spotted fever - unnamed Rickettsia (G- intracellular; tick-borne)
• Isosporiasis- Isospora belli (protozoan)

J

• Japanese B encephalitis virus - JEE virus (Flavivirus)
• Jock itch - Tinea cruris - Microsporum, Trichophyton, and Epidermophyton (fungi)
• Jorge Lobo disease - lobomycosis, Lobo's mycosis, Keloidal blastomycosis - Paracoccidioides loboi (Fungus)
• Jungle yellow fever, Yellow fever, Sylvatic yellow fever, Urban yellow fever, Vomito negro, Yellow Jack, Yellow fever virus- Flaviviridae, Flavivirus
• Junin Argentinian hemorrhagic fever - Juninvirus (Arenavirus)

K

• Kala Azar - Visceral Leishmaniasis - Leishmania leishmania donovani, L. leishmania infantum, L. leishmania chagasi (protozoan parasite) sandfly
• Keratoconjunctivitis (*) - Viral conjunctivitis- Adenovirus (Adenovirus), HSV-1 (Herpesvirus)
• Kaposi's sarcoma - Human Herpes Virus 8 (Herpesvirus) or Kaposi's Sarcoma-associated Herpes Virus (KSHV)
• Kuru - prion (a protein)
• Kyasanur forest disease - KFD virus (flavivirus) tick-borne

L

• LaCrosse encephalitis - LaCross virus (Bunyavirus)
• Lassa hemorrhagic fever - Lassavirus (Arenavirus)
• Legionnaire's pneumonia - Legionella pneumophila (G- rod: facultative-straight: respiratory pathogens)
• Lemming fever- tularemia, rabbit fever, deer fly fever, O'Hara disease, Francis disease, Francisella tularensis (G- rods: facultative-straight: zoonoses)
• Leprosy (Hansen's disease) - Mycobacterium leprae (Acid-fast positive)
• Leptospirosis -Weil's disease- canicola fever- canefield fever- nanukayami fever- 7-day fever- Leptospira interrogans (spiral shaped bacteria)
• Lemierre's Syndrome- Fusobacterium necrophorum (G- rod; anaerobe)
• Listerosis - Listeria monocytogenes (G+ rod)
• Liver fluke infection - Clonorchis sinensis, Opisthorchis viverrini, O. felineus, Fasciola hepatica (liver flukes)
• Lockjaw - Tetanus - Clostridium tetani (G+ rod; anaerobe)
• Loiasis - Eyeworm - Loa loa (parasitic worm)
• Louping Ill - Flavivirus (arbovirus) ticks
• Ludwig's angina- usually a polymicrobial infection (cellulitis of the floor of the mouth with spread to the submental, sublingual and submandibular spaces). Bacteria from mouth.
• Lung fluke infection - Paragonimus westermani
• Lyme disease - Borrelia burgdorferi (Spirochetes)
• Lyme-like illness- Masters disease- Southern tick associated rash illness (STARI)- Borrelia lonestari (possible etiology)
• Lymphogranuloma venereum (LGV) - Chlamydia trachomatis (intracellular G- bacteria; the L serotypes)

M

• Machupo Bolivian hemorrhagic fever - Machupovirus (Arenavirus)
• Madura foot- Eumycotic mycetoma-  Pseudallescheria boydii, Madurella grisea,Madurella mycetomatis (fungi)
• Malaria - Plasmodium sp. (protozoan parasite)
• Mal del pinto - Pinta - Treponema pallidum var. carateum
• Malignant pustule- Black Bane- Anthrax- Wool sorter's disease- Tanner's disease- Bacillus anthracis (G+ rod: sporulating: aerobic)
• Malta fever - Brucellosis- Brucella sp. (G- rods: facultative-straight: zoonoses)
• Marburg hemorrhagic fever - Marburg virus (Filovirus)
• Masters disease- Southern tick associated rash illness (STARI)- Lyme-like illness- Borrelia lonestari (possible etiology)
• Measles - Morbilli- Hard measles- Rubeola- measles- 14-day measles- rubeola virus (Paramyxovirus)
• Mediterannean spotted fever- Rickettsia coronii, (G-; intracellular bacteria)
• Melioidosis - Whitmore's disease- Burkholderia pseudomallei (used to be called Pseudomonas pseudomallei; G- rod: aerobic)
• Meningitis, aseptic (*) - Coxsackie A and B (Picornavirus: Enterovirus), Echovirus (Picornavirus: Enterovirus), lymphocytic choriomeningitis virus (Arenavirus), HSV-2 (Herpesvirus), Mycobacterium tuberculosis (Acid-fast)
• Meningitis, bacterial (*) - Neisseria meningitidis (G- cocci), Haemophilus influenzae (G- rod: facultative-straight: respiratory pathogens), Listeria monocytogenes (G+ rod: non-sporulating: non-filamentous), Streptoccoccus pneumoniae (G+ cocci), Group B streptococcus (G+ cocci)
• Milker's nodule - Parapoxvirus
• Molluscum contagiosum - Molluscipoxvirus (Poxvirus)
• Moniliasis- candidiasis- infection of the mucous membranes caused by the yeast Candida albicans.
• Monkeypox- Monkeypox virus- Poxviridae- Chordopoxvirus
• Mononucleosis - Epstein-Barr virus (Herpesvirus; HHV-4)
• Mononucleosis-like syndrome (*) - Cytomegalovirus (CMV; Herpesvirus; HHV-5)
• Montezuma's Revenge- Traveler's diarrhea - Any number of bacteria (Escherichia coli, Salmonella, Shigella, Yersinia, Vibrio, etc.), viruses (Rotaviruses, Norwalk-like agents), or parasites (Giardia, Entamoeba, Cryptosporidium)that cause diarrhea.
• Morbilli- Hard measles- Rubeola- measles- 14-day measles - Rubeola virus
• Mucormycosis- Zygomycosis- Rhizopus arrhizus (fungus)
• Multiple Organ Dysfunction Syndrome or MODS (*)- if infectious see Septic Shock for common causes.
• Mumps - mumps virus (Paramyxovirus)
• Murine typhus - Rickettsia typhi (G- intracellular; rodents and fleas)
• Murray Valley encephalitis - Flavivirus (arbovirus) mosquito
• Mycoburuli ulcers- Buruli ulcers- Mycobacterium ulcerans
• Mycotic vulvovaginitis- Candida albicans (yeast)
• Myositis- Streptococcus pyogenes, Staphylococcus aureus

N

• Nanukayami fever- leptospirosis -Weil's disease- canicola fever- canefield fever-7-day fever- Leptospira interrogans (spiral shaped bacteria)
• Negishi - Flavivirus (arbovirus) vector unknown
• Necrotizing fasciitis- Type 1= Streptococcus pyogenes: Type 2= Staphylococcus aureus
• New world spotted fever, Rocky Mountain spotted fever, Sao Paulo fever - Rickettsia rickettsii (Obligate intracellular)
• Nocardiosis - Nocardia (G+: non-sporulating: filamentous)
• Nongonococcal urethritis(*) - Chlamydia trachomatis (G-; intracellular bacteria), Mycoplasma genitalium (bacterium without a cell wall), Ureaplasma urealyticum (bacterium without a cell wall), Gardnerella vaginalis (G variable rod), Trichomonas vaginalis (protozoan parasite), and Herpes Simplex virus (herpes virus)
• North American blastomycosis- Gilchrist’s disease- Chicago disease- Blastomycosis-  Blastomyces dermatitidis (dimorphic fungus)
• North Asian tick typhus - Rickettsia sibirica (G- intracellular; tick-borne)
• Norwegian itch - Scabies - Sarcoptes scabiei (parasitic mite)

O

• O'Hara disease, deer fly fever, tularemia, lemming fever, rabbit fever, Francis disease, Francisella tularensis (G- rods: facultative-straight: zoonoses)
• Omsk hemorrhagic fever - OHF virus (Flavivirus; tick borne)
• Onchoceriasis - River Blindness - Onchocerca volvulus (parasitic worm)
• Onychomycosis- Tinea unguium - Ringworm of the nails- Trichophyton sp., and Epidermophyton floccosum (fungi)
• Opisthorchiasis - Liver fluke infection - Opisthorchis viverrini, O. felineus (liver flukes)
• Opthalmia neonatorium - Gonorrhea - Neisseria gonorrhoeae (G- cocci)
• Ornithosis - Parrot fever - Psittacosis - Chlamydia psittaci (G- intracellular)
• Oral hairy leukoplakia - Epstein Barr Virus (Human Herpes virus 4)
• Oriental Spotted Fever - Rickettsia japonica (G- intracellular; tick-borne)
• Oriental Sore - Leishmania leishmania major and L. leishmania tropica (protozoan parasite) sandfly
• Orf - Orfvirus (Poxvirus)
• Oroya fever - Carrion disease - Bartonellosis - Bartonella bacilliformis (weak G- polymorphic) sandfly bites at elevations of 600 to 2800 meter in Peru, Ecuador and Colombia.
• Otitis media- Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, various viruses.
• Otitis externa (*) - Pseudomonas aeruginosa (G- rod: aerobic)

P

• Parotitis - Mumps - Mumps virus (paramyxovirus)
• Paronychia - Candida albicans (yeast), Herpes Simplex virus (herpes virus)
• Parrot fever - Ornithosis- Psittacosis - Chlamydia psittaci (G- intracellular)
• Pannus - Chlamydia trachomatis (G- intracellular) eye infection
• Paragonimiasis - Lung fluke infection - Paragonimus westermani
• Paracoccidioidomycosis - Paracoccidioides brasiliensis (dimorphic fungi)
• PCP pneumonia- Pneumonia caused by Pneumocystis carinii
• Pediculosis - lice
• Peliosis hepatica - Bartonella henselae (pleomorphic G-)
• Pelvic Inflammatory Disease (PID) - two most common = Neiserria gonorrhoeae (G- coccus), Chlamydia trachomatis, then Anaerobic bacteria (ex. Bacteroides), Facultative Gram negative rods (ex. E. coli), Mycoplasma hominis, Actinomyces israelii (IUD recipients: G+ rod)
• Pertussis - Whooping cough- Bordetella pertussis (G- rods: facultative-straight: respiratory pathogens)
• Pharyngoconjunctival fever (*) - Adenovirus 1-3 and 5 (Adenovirus)
• Phaeohyphomycosis(*) - over 75 different species of fungi, most common= Phaeoaellomyces werneckii and P. hortae
• Piedra- Black Piedra= Piedraia hortai, White Piedra= Trichosporon beigelii
• Pigbel- beta-toxin of Clostridium perfringens type C
• "Pink eye" conjunctivitis (*) - Haemophilus aegyptius (G- rod: facultative-straight: respiratory pathogens) and/or Moraxella lacunata (G- diplococcus)
• Pinta - Treponema pallidum var. carateum
• Pinworm infection - Enterobiasis - Enterobius vermicularis (intestinal nematode)
• Pitted Keratolysis - Micrococcus sedentarius (G+ coccus)
• Pityriasis versicolor- Tinea versicolor- Malassezia furfur (fungus)
• Plague - Yersinia pestis (G- rod: facultative-straight: zoonoses)
• Pleurodynia - Coxsackie B (Picornavirus: Enterovirus)
• Pneumonia, viral (*) - respiratory syncytial virus (Paramyxovirus), CMV (Herpesvirus)
• Pneumocystosis - Pneumocystis carinii (protozoan parasite)
• Polio or Poliomyelitis - Polioviruses types I, II, and III (picornavirus)
• Polycystic hydatid - Echinococcus vogeli (larval cestode infection)
• Pontiac fever - Legionella pneumophila (G- rod: facultative-straight: respiratory pathogens)
• Pork tapeworm - Taenia solium
• Posada-Wernicke disease- Desert rheumatism- Coccidioidomycosis- San Joaquin Valley fever-  Coccidioides immitis (dimorphic fungus)
• Postanginal septicemia- Lemierre's Syndrome- Fusobacterium necrophorum (G- rod; anaerobe)
• Powassan - Flavivirus (arbovirus) ticks
• Progressive multifocal leukencephalopathy - JC virus (Papovavirus)
• Progressive Rubella Panencephalitis - Rubella virus (togavirus)
• Prostatitis, bacterial(*) - most common = Escherichia coli, Klebsiella sp., Proteus sp., Pseudomonas sp., Enterobacter sp., Serratia sp., (G- rods), Enterococcus feacalis (G+ coccus)
• Pseudomembranous colitis - Clostridium difficile (G+ rod: sporulating: anaerobic)
• Psittacosis - Chlamydia psittaci (G- intracellular)
• Puerperal fever- Streptococcus pyogenes
• Pyelonephritis(*) - similar to cystitis
• Pylephlebitis - Bateroides fragilis (G- anaerobic rod), Peptostreptococcus spp (G+ anaerobic cocci), Clostridium spp.(G+ anaerobic rods), and several of the Enterobacteriaceae (G- rods; ferment glucose)

Q

• Q fever - Coxiella burnetti (Obligate intracellular: Rickettsia)
• Australian tick typhus- Australian Spotted Fever- Queensland Tick Typhus- Rickettsia australis, (G-; intracellular bacteria)
• Quinsy- Peritonsillar abscess- a complication of untreated Strep. throat (Streptococcus pyogenes)
• Quintana fever, 5-day fever, Trench fever, Shinbone fever, Wolhynia fever,  His-Werner disease- Bartonella quintana (G- rod)

R

• Rabies - rabies virus (Rhabdovirus)
• Rabbit fever- deer fly fever, tularemia, lemming fever, O'Hara disease, Francis disease, Francisella tularensis (G- rods: facultative-straight: zoonoses)
• Racoon roundworm infection- Baylisascaris infection - Baylisascaris procyonis
• Rat bite fever - Streptobacillus moniliformis (G-; rod)
• Rat tapeworm - Hymenolepis diminuta
• Reiter Syndrome (*)- resulting from a nongonococcal sexually transmitted disease due usually to Chlamydia trachomatis or from an infectious diarrhea (Shigella, Salmonella, Yersinia). Persons with an HLA-B27 major histocompatibility complex are more likely to get this disease.
• Relapsing fever- Borrelia recurrentis
• Rheumatic fever - Streptococcus pyogenes (nonsuppurative complication of Strep throat)
• Rhodotorulosis - Rhodotorula spp. (fungus)
• Rickettsialpox - Rickettsia akari (G-; intracellular) from mite bites
• Rift Valley Fever- Rift valley fever virus- Bunyavirus- Phlebovirus
• Ringworm - Microsporum, Trichophyton, and Epidermophyton (fungi)
• River Blindness - Onchoceriasis - Onchocerca volvulus (parasitic worm)
• Ritter's Disease- Filatow-Dukes' Disease, Scalded Skin Syndrome- Staphylococcus aureus-  (exfoliative toxin producing strains)
• Rocky Mountain spotted fever, New world spotted fever, Sao Paulo fever - Rickettsia rickettsii (Obligate intracellular)
• Rose Handler's disease - Sporotrichosis - Sporothrix schenckii (dimorphic fungi)
• Rose rash of infants- Sixth disease - Zahorsky's disease - Roseola infantum - Exanthem subitum - "Sudden Rash"- 3-day fever-  Human Herpes virus 6 (HHV-6)
• Roseola - Roseola infantum - Sixth disease - Zahorsky's disease - Exanthem subitum - Human Herpes virus 6 (HHV-6)
• Roundworm infections - Ascariasis - Ascaris lumbricoides (intestinal nematode)
• Rotavirus infections - Rotavirus (reovirus)
• Rubella - German measles- 3-day measles- rubella virus (Togavirus)
• Rubeola-measles- 14-day measles- Hard measles- Morbilli- Rubeola virus
• Russian spring-summer encephalitis- Far Eastern tick-borne encephalitis- Spring-summer encephalitis- Taiga encephalitis- Russian spring-summer encephalitis virus- Flaviviridae

S

• Salmonellosis - Salmonella spp. (G- rod)
• San Joaquin Valley fever- Posada-Wernicke disease- Desert rheumatism- Coccidioidomycosis-  Coccidioides immitis (dimorphic fungus).
• Sao Paulo Encephalitis - Flavivirus (arbovirus)
• Sao Paulo fever, New world spotted fever, Rocky Mountain spotted fever- Rickettsia rickettsii (Obligate intracellular)
• SARS- Severe Acute Respiratory Syndrome- SARS-associated coronavirus or SARS-CoV
• Scabies - Norwegian itch - Sarcoptes scabiei (parasitic mite)
• Scarlet fever - Scarlatina- Streptococcus group A (Streptococcus pyogenes)
• Scarlatina- Scarlet fever - Streptococcus group A (Streptococcus pyogenes)
• Scalded Skin Syndrome- Ritter's Disease- Filatow-Dukes' Disease- Staphylococcus aureus- (exfoliative toxin producing strains)
• Schistosomiasis - Schistosoma mansoni, S. japonicum, and S. haematobium (protozoan parasites; blood flukes)
• Scrub typhus - Rickettsia tsutsugamushi (G- intracellular; chigger bite)
• Sennetsu fever - Ehrlichiosis - Ehrlichia sp. (G- intracellular bacteria) transmitted by ticks
• Sepsis- See Septic Shock below.
• Septic Shock(*) - Most are due to bacterial infections. 50% due to Gram negative bacteria; 50% due to Gram positive bacteria. It depends on the location of the site of the initial infection. Most common sites of infection leading to sepsis are lungs, abdomen, and urinary tract (ex. urinary tract think Escherichia coli; community acquired pneumonia think Streptococcus pneumoniae).
• 7-day fever- Weil's disease - leptospirosis - canicola fever- canefield fever- nanukayami fever- Leptospira interrogans (spiral shaped bacteria)
• Severe Acute Respiratory Syndrome- SARS-coronavirus or SARS-CoV
• Shigellosis - Shigella sp. (G- rod)
• Shingles (zoster) - varicella zoster virus (Herpesvirus)
• Shipping fever - Pasteurella multocida (G- rods: facultative-straight: zoonoses)
• Siberian tick typhus- Rickettsia sibirica, (G-; intracellular bacteria)
• Sinusitis(*) - most common causes overall are respiratory viruses; most common bacterial causes = Streptococcus pneumoniae (G+ coccus) and Haemophilus influenzae (G- pleomorphic rod) (renamed and now called acute rhinosinusitis or acute bacterial rhinosinusitis)
• Sixth disease - Zahorsky's disease - Roseola infantum - Exanthem subitum - "Sudden Rash"- 3-day fever- Rose rash of infants- Human Herpes virus 6 (HHV-6) and HHV-7 (occasionally)
• "Slapped cheek" disease (erythema infectiosum; Fifth disease) - Parvovirus B19 (Parvovirus)
• Sleeping sickness- viral encephalitis - Mumps virus, Human Herpes virus 1, any of 350 different Arboviruses, Poxvirus, Enteroviruses (polio, Coxsackie, ECHO), Adenoviruses, Human Immunodeficiency Virus (retrovirus)
• Smallpox - variola virus (Poxvirus) - no naturally acquired cases since October 1977; Somalia
• Snail Fever- Schistosoma (protozoan parasite)
• Soft chancre - Chancroid - Haemophilus ducreyi (G- rod: facultative-straight: respiratory pathogens)
• Southern tick associated rash illness (STARI)- Lyme-like illness- Masters disease- Borrelia lonestari (possible etiology)
• Sparganosis - Spirometra sp.(cestode larvae infection)
• Spelunker’s disease- Cave disease- Darling's Disease- Histoplasmosis- Histoplasma capsulatum (dimorphic fungus)
• Spotted fever- same as meningitis (bacterial)
• Sporadic typhus- Rickettsia prowazekii, (G-, intracellular bacterium; spread by fleas)
• Sporotrichosis - Sporothrix schenckii (dimorphic fungi)
• Spring-summer encephalitis- Far Eastern tick-borne encephalitis- Russian spring-summer encephalitis- Taiga encephalitis- Russian spring-summer encephalitis virus- Flaviviridae
• St. Louis encephalitis - SLE virus (Flavivirus)
• Strep. throat- Streptococcus pyogenes (G+ coccus).
• Stye- Hordeola- Staphylococcus aureus
• Strongyloiciasis - Threadworm - Strongyloides stercoralis (intestinal nematode)
• Subacute Sclerosing Panencephalitis (SSPE) - Measles virus
• "Sudden Rash"- 3-day fever- Exanthem subitum - Roseola infantum - Sixth disease - Zahorsky's disease- Rose rash of infants- Human Herpes virus 6 (HHV-6)
• Swimmer's ear- Otitis externa- Pseudomonas aeruginosa (common in diabetic patients)
• Swimmer's Itch - Schistosoma avium (bird schistosomes)(protozoan parasite)
• Swimming Pool conjunctivitis- Inclusion conjunctivitis - Pannus - Chlamydia trachomatis (G- intracellular) eye infection
• Syphilis - Treponema pallidum subsp. pallidum (Spirochetes; bacteria)
• Systemic Inflammatory Response Syndrome or SIRS (*)- if infectious see Septic Shock for common causes.
• Sylvatic yellow fever, Yellow Jack, Jungle yellow fever, Yellow fever, Urban yellow fever, Vomito negro, Yellow fever virus- Flaviviridae, Flavivirus

T

• Tabes dorsalis - tertiary syphilis - Treponema pallidum subsp. pallidum (Spirochetes)
• Taeniasis - see Tapeworm infections with Taenia species.
• Taiga encephalitis- Russian spring-summer encephalitis- Far Eastern tick-borne encephalitis- Spring-summer encephalitis- Russian spring-summer encephalitis virus- Flaviviridae
• Tanner's disease - Wool sorters' disease- Malignant pustule- Black Bane- Bacillus anthracis (G+ rod: sporulating: aerobic)
• Tapeworm infections - Taenia solium (pork tapeworm), Taenia saginata (beef tapeworm), Diphyllobothrium latum (fish tapeworm),Hymenolepis nana (dwarf tapeworm), Hymenolepis diminuta (rat tapeworm), Diphylidium caninum (dog tapeworm)  (intestinal cestodes)
• TB- Tuberculosis - Mycobacterium tuberculosis (Acid-fast bacterium)
• Temporal lobe encephalitis (*) - HSV-1 (Herpesvirus)
• Tetanus - Clostridium tetani (G+ rod: sporulating: anaerobic)
• Threadworm infections - Strongyloiciasis - Strongyloides stercoralis (intestinal nematode)
• 3-day fever- Exanthem subitum - Roseola infantum - Sixth disease - Zahorsky's disease- "Sudden Rash", Rose rash of infants- Human Herpes virus 6 (HHV-6)
• 3-day measles- German measles- Rubella- Rubella virus
• Thrush - Candida albicans (yeast)
• Tick-borne encephalitis- Biphasic meningoencephalitis, Central European tick-borne encephalitis, Czechoslovak tick-borne encephalitis, Diphasic milk fever, Viral meningoencephalitis, Tick-borne encephalitis virus- Flaviviridae
• Tick typhus- Fievre boutonneuse- Rickettsia conori
• Tinea barbae - Trichophyton verrucosum, T. mentagrophytes, T. rubrum, T. megninii (fungi)
• Tinea capitis - Ringworm of the head- Microsporum sp., Trichophyton sp.(fungi)
• Tinea corporis - Ringworm of the body- Microsporum, Trichophyton, and Epidermophyton floccosum (fungi)
• Tinea manuum - Ringworm of the hand- Trichophyton sp., and Epidermophyton floccosum (fungi)
• Tinea cruris - Ringworm of the groin- Candida albicans (yeast), Trichophyton sp., and Epidermophyton floccosum (fungi)
• Tinea nigra- Exophiala werneckii
• Tinea pedis - Ringworm of the feet- Trichophyton sp., and Epidermophyton floccosum(fungi)
• Tinea unguium - Onychomycosis- Ringworm of the nails- Trichophyton sp., and Epidermophyton floccosum (fungi)
• Tinea versicolor- Pityriasis versicolor- Malassezia furfur (fungus)
• Torulopsosis - Torulopsis glabrata and T. candida (fungus)
• Torulosis- Busse-Buschke disease- Cryptococcosis- European blastomycosis- Cryptococcus neoformans (encapsulated yeast)
• Toxic Shock Syndrome - Staphylcoccus aureus (G+ cocci; producing TSST) and Streptococcus pyogenes (G+ cocci)
• Toxoplasmosis - Toxoplasma gondii (protozoan parasite)
• Traveler's diarrhea - Any number of bacteria (Escherichia coli (most common), Salmonella, Shigella, Yersinia, Vibrio, etc.), viruses (Rotaviruses, Norwalk-like agents), or parasites (Giardia, Entamoeba, Cryptosporidium) that cause diarrhea.
• Trench fever, 5-day fever, Shinbone fever, Wolhynia fever, Quintana fever, His-Werner disease- Bartonella quintana (G- rod)
• Trench mouth or Vincent's disease- Various anaerobic bacteria in the mouth
• Trichinellosis- Trichinella spiralis (nematode parasite)
• Trichomoniasis - Vaginitis - Trichomonas vaginalis (protozoan parasite)
• Trichomycosis axillaris - Corynebacterium tenuis (G+ rod)
• Trichuriasis - Whipworm infection - Trichuris trichiura (intestinal nematode)
• Tropical Spastic Paraparesis (TSP) - Human T-cell Leukemia viruses I or II (retrovirus)
• Trypanosomiasis - African= Trypanosoma brucei rhodesiense, Trypanosoma brucei gambiense (tsetse fly-borne), American= Trypanosoma cruzi (Triatomine bugs= kissing bug or assassin bugs)
• Tuberculosis - TB- Mycobacterium tuberculosis (Acid-fast bacterium)
• Tularemia- lemming fever, rabbit fever, deer fly fever, O'Hara disease, Francis disease, Francisella tularensis (G- rods: facultative-straight: zoonoses)
• Typhoid fever - Salmonella typhi (G- rod: facultative-straight: enteric pathogens)
• Typhus fever - Rickettsia prowazekii (G- intracellular; louse-borne), Rickettsia typhi (G- intracellular; flea-borne)

U, V

• Ulcus molle - Soft chancre - Chancroid - Haemophilus ducreyi (G- rod: facultative-straight: respiratory pathogens)
• Undulant fever - Brucella sp. (G- coccobacillus: zoonoses)
• Urban yellow fever, Sylvatic yellow fever, Yellow Jack, Jungle yellow fever, Yellow fever, Vomito negro, Yellow fever virus- Flaviviridae, Flavivirus
• Urethritis - Herpes Simplex virus, Chlamydia trachomatis, Ureaplasma urealyticum, Neisseria gonorrhoeae
• Vaginosis, bacterial - Peptostreptococccus sp., Bacteriodes sp., Gardnerella vaginalis, Mobiluncus sp., Mycoplasma sp. (clue cells)
• Vaginitis - Candida albicans (yeast; Mycotic vulvovaginitis), Trichomonas vaginalis (protozoan parasite; Trichomoniasis)
• Varicella -chickenpox - Varicella-Zoster virus (VZV or Human herpes 3 virus)
• Venezuelan Equine encephalitis - Togaviridae, Alphavirus
• Verruga peruana- Carrion's disease - Bartonellosis - Oroya fever - Bartonella bacilliformis (weak G- polymorphic) sandfly bites at elevations of 600 to 2800 meter in Peru, Ecuador and Colombia.
• Vincent's disease or Trench mouth- Various anaerobic bacteria in the mouth
• Viral conjunctivitis (*) - Keratoconjunctivitis - Adenovirus (Adenovirus), HSV-1 (Herpesvirus)
• Viral meningoencephalitis- Czechoslovak tick-borne encephalitis, Central European tick-borne encephalitis, Diphasic milk fever, Biphasic meningoencephalitis, Tick-borne encephalitis, Tick-borne encephalitis virus- Flaviviridae
• Viral rash- Duke's disease- Coxsackievirus or Echovirus
• Visceral Larval Migrans - Toxocara canis (parasitic nematode)
• Vomito negro, Urban yellow fever, Sylvatic yellow fever, Yellow Jack, Jungle yellow fever, Yellow fever, Yellow fever virus- Flaviviridae, Flavivirus
• Vulvovaginitis - Candida albicans (yeast), Trichomonas vaginalis (protozoan parasite), and the causes of bacterial vaginosis.

W

• Warts - Papilloma viruses
• Waterhouse-Friderichsen syndrome - Neisseria meningitidis (G- cocci)
• Weil's disease - Leptospirosis - canicola fever- canefield fever- nanukayami fever- 7-day fever- Leptospira interrogans (spiral shaped bacteria)
• West Nile Fever- West Nile virus- Flavivirus Japanese Encephalitis Antigenic Complex
• Western equine encephalitis - WEE virus,  Togaviridae, Alphavirus
• Whipple's disease - Tropheryma whippelii (G+ rod a actinomycete)
• Whipworm infection - Trichuriasis - Trichuris trichiura
• White Piedra- Trichosporon beigelii
• Whitmore's disease- Melioidosis - Burkholderia pseudomallei (used to be called Pseudomonas pseudomallei; G- rod: aerobic)
• Whitlow - paronchyia - Herpes simplex virus (herpesvirus)
• Whooping cough - Pertussis- Bordetella pertussis (G- small rod)
• Winter diarrhea - Rotavirus infections - Rotavirus (reovirus)
• Wolhynia fever, His-Werner disease, Quintana fever, 5-day fever, Trench fever, Shinbone fever- Bartonella quintana (G- rod)
• Wool sorters' disease - Anthrax- Tanner's disease- Malignant pustule- Black Bane- Bacillus anthracis (G+ rod: sporulating: aerobic)

XYZ

• Yaws -Treponema pallidum var. pertenue (spirochete)
• Yellow fever, Jungle yellow fever, Sylvatic yellow fever, Urban yellow fever, Vomito negro, Yellow Jack, Yellow fever virus- Flaviviridae, Flavivirus
• Yellow Jack, Jungle yellow fever, Yellow fever, Sylvatic yellow fever, Urban yellow fever, Vomito negro, Yellow fever virus- Flaviviridae, Flavivirus
• Yersinosis - Yersinia enterocolitica
• Zahorsky's disease - Roseola infantum - Exanthem subitum - Sixth disease - Human Herpes virus 6 (HHV-6)
• Zoster - shingles- Varicella-Zoster virus (VZV or Human herpes 3 virus)
• Zygomycosis- Mucormycosis- Rhizopus arrhizus (fungus)

© 1996-2008 Neal R. Chamberlain. All rights reserved. 
Site Last Revised 12/2/09
Neal Chamberlain, Ph.D., A. T. Still University of Health Sciences/Kirksville College of Osteopathic Medicine.

Site maintained by: Neal R. Chamberlain PhD.: nchamberlain@atsu.edu 

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