Rich focus

A Rich focus is a tuberculous granuloma occurring on the cortex of the brain that ruptures into the subarachnoid space, causing tuberculous meningitis. It is named for Arnold Rice Rich who first described it.

v • d • e Bacterial diseases (primarily A00-A79, 001-041,080-109)

G+/Firmicutes	Clostridium (Pseudomembranous colitis, Botulism, Tetanus, Gas gangrene) - Streptococcus A and B (Scarlet fever, Erysipelas) - Staphylococcus (Toxic shock syndrome) - Bacilli (Anthrax, Listeriosis)

G+/Actinobacteria	Mycobacterium: Tuberculosis (Ghon focus, Ghon's complex, Tuberculous meningitis, Pott's disease, Rich focus, Scrofula, Bazin disease, Lupus vulgaris, Miliary tuberculosis) - Leprosy - Lady Windermere syndrome - Buruli ulcer - Actinomycetales: Actinomycosis - Nocardiosis - Diphtheria - Erythrasma

G-/Spirochetal	Syphilis (Bejel) - Yaws - Pinta - Relapsing fever - Noma - Trench mouth - Lyme disease - Rat-bite fever (Sodoku) - Leptospirosis

G-/Chlamydiae	Chlamydophila (Psittacosis) - Chlamydia (Chlamydia, Lymphogranuloma venereum, Trachoma)

G-/α Proteobacteria	Rickettsioses (Typhus, Scrub typhus, Rocky Mountain spotted fever, Boutonneuse fever, Q fever, Trench fever, Rickettsialpox) - Brucellosis - Cat scratch fever Bartonellosis (Bacillary angiomatosis)

G-/β&γ Proteobacteria	Salmonella (Typhoid fever, Paratyphoid fever, Salmonellosis) - other intestinal (Cholera, Shigellosis) - Zoonotic (Bubonic plague, Tularemia, Glanders, Melioidosis, Pasteurellosis) - Other: Pertussis - Meningococcus (Meningococcal disease, Waterhouse-Friderichsen syndrome) - Legionellosis - Brazilian purpuric fever - Chancroid - Donovanosis - Gonorrhea

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