TO GO BACK TO MY 

A

• Acute hemorrhagic conjunctivitis (*) - Coxsackie A-24 virus (Picornavirus: Enterovirus), Enterovirus 70 (Picornavirus: Enterovirus)
• Acute hemorrhagic cystitis (*) - Adenovirus 11 and 21 (Adenovirus)
• Acquired Immunodeficiency Sydrome (AIDS) - Human Immunodeficiency Virus (HIV-1 and HIV-2) (retrovirus)
• 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)
• Anthrax - 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)

B

• Babesiosis - Babesia microti (protozoan parasite; transmitted by dear tick)
• Bang's disease - Brucellosis - Brucella sp. (G- coccobacillus; zoonoses)
• Bay sore - Chiclero's ulcer - Leishmania leishmania mexicana (protozoan parasite) sandfly
• Bartonellosis - Oroya fever - Carrion disease - Bartonella bacilliformis (weak G- polymorphic) sandfly bites at elevations of 600 to 2800 meter in Peru, Ecuador and Colombia.
• "Black death" (plague) - Yersinia pestis (G- rod: facultative-straight: zoonoses)
• Bacillary angiomatosis - Bartonella henselae (pleomorphic G-)
• Beaver fever - giardiasis - Giardia lamblia
• Beef tapeworm - Taenia saginata
• Bejel - endemic syphilis - Treponema pallidum var. pallidum
• Boils - Staphylcoccus aureus (G+ coccus)
• Bornholm disease (pleurodynia) - Coxsackie B (Picornavirus: Enterovirus)
• Botulism - Clostridium botulinum (G+ rod: sporulating: anaerobic)
• Boutonneuse fever - Rickettsia conorii (G- intracellular; tick-borne)
• Brazilian purpuric fever - Haemophilus aegyptius (G- rod: facultative-straight: respiratory pathogens)
• 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)

C

• California group encephalitis - California encephalitis virus, La Crosse virus, Jamestown Canyon, Snowshoe hare virus (Bunyavirus) mosquitoes
• Capillariasis - Capillaria philippinensis (intestinal nematode)
• Carate - Mal del pinto - Pinta - Treponema pallidum var. carateum
• Carbuncle -  Staphylcoccus aureus (G+ coccus)
• Carrion 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 - Bartonella henselae (pleomorphic G-)
• Cervical cancer - human papilloma virus (Papovavirus)
• Chancroid - Haemophilus ducreyi (G- rod: facultative-straight: respiratory pathogens)
• 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)
• 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)
• Coenurosis - Taenia spp.(larval cestode infection)
• Colorado tick fever - Colorado tick fever virus (Reovirus)
• 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)
• Croup, infectious - parainfluenza viruses 1-3 (Paramyxovirus)
• Cutaneous Larval Migrans - Ancylostoma braziliense (filariform larvae; parasite) and many other parasitic worms normally found in animals.
• 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)

D

• Dengue - dengue fever - dengue virus (Flavivirus)
• "Devil's grip"(pleurodynia) - Coxsackie B (Picornavirus: Enterovirus)
• Diphtheria - Corynebacterium diphtheriae (G+ rod: non-sporulating: non-filamentous)
• Dwarf tapeworm - Hymenolepis nana (intestinal cestode)
• Dog tapeworm - Diphylidium caninum (intestinal cestode)
• Donovanosis - Calymmatobacterium granulomatis (G- rod; Donovan bodies)
• Dracontiasis - Guinea Worm - Dirofilaria medinensis (parasitic worm)
• 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
• Endemic syphilis -Bejel - Treponema pallidum var. pallidum
• Endothrix - fungal infection of the hair shaft - Microsporum, Trichophyton, and Epidermophyton (fungi)
• Enterobiasis - Pinworm infection - Enterobius vermicularis (intestinal nematode)
• Epiglottitis (*)- Haemophilus influenzae (G- rod: facultative-straight: respiratory pathogens
• Erysipeloid - Erysipelothricosis - Erysipelothrix rhusiopathiae (G+ rod)
• 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
• Eyeworm - Loiasis - Loa loa (parasitic worm)
• Exanthem subitum - Roseola infantum - Sixth disease - Zahorsky's disease - Human Herpes virus 6 (HHV-6)

F

• Fascioliasis - Liver fluke infection - Fasciola hepatica (liver flukes)
• "Fifth" disease (erythema infectiosum) - Parvovirus B19 (Parvovirus)
• Fish tapeworm - Diphyllobothrium latum
• Fitz-Hugh-Curtis syndrome - Perihepatitis - Neisseria gonorrhoeae (G- cocci)
• Four Corners Disease - Human Pulmonary Syndrome (HPS) - Sin Nombre Virus (Hantaan virus group; Bunyavirus)
• Frambesia - Yaws -Treponema pallidum var. pertenue
• Furunculosis = boil -  Staphylcoccus aureus (G+ coccus)
• Folliculitis - Staphylcoccus aureus (G+ coccus)

G

• Gas gangrene - Clostridium perfringens (G+ rod: sporulating: anaerobic)
• Gastroenteritis - Norwalk virus (Calicivirus), rotavirus (Reovirus)
• Gerstmann-Straussler-Scheinker (GSS) - - prion (a protein)
• Giardiasis - Giardia lamblia
• Gingivostomatitis - HSV-1 (Herpesvirus)
• Glanders - Burkholderia mallei (used to be named Pseudomonas mallei; G- rod)
• Gonorrhea - Neisseria gonorrhoeae (G- cocci)
• Granuloma inguinale -  Calymmatobacterium granulomatis (G- rod)
• Guinea Worm - Dracontiasis - Dirofilaria medinensis (parasitic worm)

H

• Hand-foot-mouth disease - Coxsackie A-16 virus (Picornavirus: Enterovirus)
• Hansen's disease - Mycobacterium leprae (Acid-fast positive)
• Hantaan-Korean hemorrhagic fever - Hantavirus (Bunyavirus)
• Hantavirus Pulmonary Syndrome (HPS) - Hantavirus (Bunyavirus)
• Hard chancre - syphilis - Treponema pallidum subsp. pallidum
• Haverhill fever - Rat bite fever - Streptobacillus moniliformis (G-; rod)
• Helicobacterosis - duodenal ulcers - Helicobacter pylori (G- curved rod)
• 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)
• Hepatitis G - hepatitis G virus (RNA virus)
• 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)
• Hookworm infections - Ancylostoma duodenale, Necator americanus (intestinal nematode)
• 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)
• Hydatid cyst  - Echinococcus granulosus, Echinococcus multilocularis, Echinococcus vogeli (larval cestode infection)
• Hydrophobia - Rabies - Rabies virus (Rhabdovirus)

I

• Inclusion conjunctivitis - Pannus - Chlamydia trachomatis (G- intracellular) eye infection
• Infectious Mononucleosis - Epstein-Barr virus (Herpesvirus; HHV-4)
• Infectious myocarditis (*) - Coxsackie B1-B5 (Picornavirus: Enterovirus)
• Infectious pericarditis (*)- Coxsackie B1-B5 (Picornavirus: Enterovirus)
• Influenza - Influenza viruses A, B, and C (Orthomyxovirus)
• Israeli spotted fever - unnamed Rickettsia (G- intracellular; tick-borne)

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)
• Junin Argentinian hemorrhagic fever - Juninvirus (Arenavirus)

K

• Kala Azar - Visceral Leishmaniasis - Leishmania leishmania donovani, L. leishmania infantum, L. leishmania chagasi (protozoan parasite) sandfly
• Keratoconjunctivitis (*) - 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)
• Leprosy (Hansen's disease) - Mycobacterium leprae (Acid-fast positive)
• Leptospirosis - Leptospirosis - Leptospira interrogans (spiral shaped bacteria)
• 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
• Lung fluke infection - Paragonimus westermani
• Lyme disease - Borrelia burgdorferi (Spirochetes)
• Lymphogranuloma venereum (LGV) - Chlamydia trachomatis (intracellular G- bacteria; the L serotypes)

M

• Machupo Bolivian hemorrhagic fever - Machupovirus (Arenavirus)
• Malaria - Plasmodium sp. (protozoan parasite)
• Mal del pinto - Pinta - Treponema pallidum var. carateum
• Malta fever - Brucella sp. (G- rods: facultative-straight: zoonoses)
• Marburg hemorrhagic fever - Marburg virus (Filovirus)
• Measles - rubeola virus (Paramyxovirus)
• Melioidosis - 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)
• Mononucleosis - Epstein-Barr virus (Herpesvirus; HHV-4)
• Mononucleosis-like syndrome (*) - Cytomegalovirus (CMV; Herpesvirus; HHV-5)
• Mumps - mumps virus (Paramyxovirus)
• Murine typhus - Rickettsia typhi (G- intracellular; rodents and fleas)
• Murray Valley encephalitis - Flavivirus (arbovirus) mosquito

N

• Negishi - Flavivirus (arbovirus) vector unknown
• 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 Asian tick typhus - Rickettsia sibirica (G- intracellular; tick-borne)
• Norwegian itch - Scabies - Sarcoptes scabiei (parasitic mite)

O

• Omsk hemorrhagic fever - OHF virus (Flavivirus; tick borne)
• Onchoceriasis - River Blindness - Onchocerca volvulus (parasitic worm)
• 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 externa (*) - Pseudomonas aeruginosa (G- rod: aerobic)

P

• Parotitis - Mumps - Mumps virus (paramyxovirus)
• Paronychia - Candida albicans (yeast), Herpes Simplex virus (herpes virus)
• Parrot fever - Psittacosis - Chlamydia psittaci (G- intracellular)
• Pannus - Chlamydia trachomatis (G- intracellular) eye infection
• Paragonimiasis - Lung fluke infection - Paragonimus westermani
• Paracoccidioidomycosis - Paracoccidioides brasiliensis (dimorphic fungi)
• Pediculosis - lice
• Peliosis hepatica - Bartonella henselae (pleomorphic G-)
• Pelvic Inflammatory Disease (PID) - two most common = Neiserria gonorrhoeae (G- coccus), Chlamydis trachomatis, then Anaerobic bacteria (ex. Bacteroides), Facultative Gram negative rods (ex. E. coli), Mycoplasma hominis, Actinomyces israelii (IUD recipients: G+ rod)
• Pertussis - 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
• "Pink eye" conjunctivitis (*) - Haemophilus aegyptius (G- rod: facultative-straight: respiratory pathogens)
• Pinta - Treponema pallidum var. carateum
• Pinworm infection - Enterobiasis - Enterobius vermicularis (intestinal nematode)
• Pitted Keratolysis - Micrococcus sedentarius (G+ coccus)
• 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
• 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 dificile (G+ rod: sporulating: anaerobic)
• Psittacosis - Chlamydia psittaci (G- intracellular)
• 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)
• Queensland tick typhus - Rickettsia australis (G- intracellular; tick-borne)

R

• Rabies - rabies virus (Rhabdovirus)
• Rat bite fever - Streptobacillus moniliformis (G-; rod)
• Rat tapeworm - Hymenolepis diminuta
• Rheumatic fever - Streptococcus pyogenes (nonsuppurative complication of Strep throat)
• Rhodotorulosis - Rhodotorula spp. (fungus)
• Rickettsialpox - Rickettsia akari (G-; intracellular) from mite bites
• Ringworm - Microsporum, Trichophyton, and Epidermophyton (fungi)
• River Blindness - Onchoceriasis - Onchocerca volvulus (parasitic worm)
• Rocky Mountain spotted fever - Rickettsia rickettsii (Obligate intracellular)
• Rose Handler's disease - Sporotrichosis - Sporothrix schenckii (dimorphic fungi)
• 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 - rubella virus (Togavirus)

S

• Salmonellosis - Salmonella spp. (G- rod)
• Sao Paulo Encephalitis - Flavivirus (arbovirus)
• Scabies - Norwegian itch - Sarcoptes scabiei (parasitic mite)
• Scarlet fever - Streptococcus group A
• Scalded Skin Syndrome - 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
• Septic Shock(*) - Most common Escherichia coli (G- rod)
• Shigellosis - Shigella sp. (G- rod)
• Shingles (zoster) - varicella zoster virus (Herpesvirus)
• Shipping fever - Pasteurella multocida (G- rods: facultative-straight: zoonoses)
• Sinusitis(*) - most common= Streptococcus pneumoniae (G+ coccus) and Haemophilus influenzae (G- pleomorphic rod)
• Sixth disease - Zahorsky's disease - Roseola infantum - Exanthem subitum - Human Herpes virus 6 (HHV-6)
• Smallpox - variola virus (Poxvirus) - no naturally acquired cases since October 1977; Somalia
• "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)
• Sparganosis - Spirometra sp.(cestode larvae infection)
• Spotted fever- same as meningitis (bacterial)
• Soft chancre - Chancroid - Haemophilus ducreyi (G- rod: facultative-straight: respiratory pathogens)
• Sporotrichosis - Sporothrix schenckii (dimorphic fungi)
• St. Louis encephalitis - SLE virus (Flavivirus)
• Strongyloiciasis - Threadworm - Strongyloides stercoralis (intestinal nematode)
• Subacute Sclerosing Panencephalitis (SSPE) - Measles virus
• Swimmer's Itch - Schistosoma avium (bird schistosomes)(protozoan parasite)
• Syphilis - Treponema pallidum (Spirochetes)

T

• Tabes dorsalis - tertiary syphilis - Treponema pallidum subsp. pallidum (Spirochetes)
• Taeniasis - see Tapeworm infections with Taenia species.
• Tanner's disease - 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)
• Temporal lobe encephalitis (*) - HSV-1 (Herpesvirus)
• Tetanus - Clostridium tetani (G+ rod: sporulating: anaerobic)
• Threadworm infections - Strongyloiciasis - Strongyloides stercoralis (intestinal nematode)
• Thrush - Candida albicans (yeast)
• 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 pedis - Ringworm of the feet- Trichophyton sp., and Epidermophyton floccosum(fungi)
• Tinea unguium - Ringworm of the nails- Trichophyton sp., and Epidermophyton floccosum (fungi)
• Torulopsosis - Torulopsis glabrata and T. candida (fungus)
• Toxic Shock Syndrome - Staphylcoccus aureus (G+ cocci; producing TSST) and Streptococcus pyogenes (G+ cocci)
• Toxoplasmosis - Toxoplasma gondii (protozoan parasite)
• Traveler's diarrhea - Escherichia coli (G- rod)
• Trichuriasis - Whipworm infection - Trichuris trichiura (intestinal nematode)
• Trichomoniasis - Vaginitis - Trichomonas vaginalis (protozoan parasite)
• Trichomycosis axillaris - Corynebacterium tenuis (G+ rod)
• 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 - Mycobacterium tuberculosis (Acid-fast)
• Tularemia - 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)
• 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), Trichomonas vaginalis (protozoan parasite)
• Varicella -chickenpox - Varacella-Zoster virus (VZV or Human herpes 3 virus)
• Venezuelan Equine encephalitis - Alphavirus (arbovirus)
• Visceral Larval Migrans - Toxocara canis (parasitic nematode)
• Vulvovaginitis - Candida albicans (yeast), Trichomonas vaginalis (protozoan parasite), and the causes of bacterial vaginosis.

W

• Warts - Papilloma viruses
• Weil's diseases - Leptospirosis - Leptospira interrogans (spiral shaped bacteria)
• Western equine encephalitis - WEE virus (Togavirus)
• Whipple disease - Tropheryma whippelii (G+ rod a actinomycete)
• Whipworm infection - Trichuriasis - Trichuris trichiura
• Whitlow - paronchyia - Herpes simplex virus (herpesvirus)
• Whooping cough - Bordetella pertussis (G- small rod)
• Winter diarrhea - Rotavirus infections - Rotavirus (reovirus)
• Wool sorters' disease - Bacillus anthracis (G+ rod: sporulating: aerobic)

XYZ

• Yaws -Treponema pallidum var. pertenue (spirochete)
• Yellow fever - Yellow fever virus (Flavivirus)
• Yersinosis - Yersinia enterocolitica
• Zahorsky's disease - Roseola infantum - Exanthem subitum - Sixth disease - Human Herpes virus 6 (HHV-6)
• Zoster - Varicella-Zoster virus (VZV or Human herpes 3 virus)

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