18 - Bacteria That Cause Disease in Humans - Major categories and groups

I. Gram-negative eubacteria that have cell walls
Group 1: The spirochetes	Treponema
	Borrelia
	Leptospira
Group 2: Aerobic/microaerophilic, motile helical/vibroid gram-negative bacteria	Campylobacter
	Helicobacter
	Spirillum
Group 3: Nonmotile (or rarely motile) curved bacteria	None
Group 4: Gram-negative aerobic/microaerophilic rods and cocci	Alcaligenes
	Bordetella
	Brucella
	Francisella
	Legionella
	Moraxella
	Neisseria
	Pseudomonas
	Rochalimaea
	Bacteroides (some species)
Group 5: Facultatively anaerobic gram-negative rods	Escherichia (and related coliform bacteria)
	Klebsiella
	Proteus
	Providencia
	Salmonella
	Shigella
	Yersinia
	Vibrio
	Haemophilus
	Pasteurella
Group 6: Gram-negative, anaerobic, straight, curved, and helical rods	Bacteroides
	Fusobacterium
	Prevotella
Group 7: Dissimilatory sulfate- or sulfur-reducing bacteria	None
Group 8: Anaerobic gram-negative cocci	None
Group 9: The rickettsiae and chlamydiae	Rickettsia
	Coxiella
	Chlamydia
Group 10: Anoxygenic phototrophic bacteria	None
Group 11: Oxygenic phototrophic bacteria	None
Group 12: Aerobic chemolithotrophic bacteria and assorted organisms	None
Group 13: Budding or appendaged bacteria	None
Group 14: Sheathed bacteria	None
Group 15: Nonphotosynthetic, nonfruiting gliding bacteria	Capnocytophaga
Group 16: Fruiting gliding bacteria: the myxobacteria	None
II. Gram-positive bacteria that have cell walls
Group 17: Gram-positive cocci	Enterococcus
	Peptostreptococcus
	Staphylococcus
	Streptococcus
Group 18: Endospore-forming gram-positive rods and cocci	Bacillus
	Clostridium
Group 19: Regular, nonsporing gram-positive rods	Erysepelothrix
	Listeria
Group 20: Irregular, nonsporing gram-positive rods	Actinomyces
	Corynebacterium
	Mobiluncus
Group 21: The mycobacteria	Mycobacterium
Groups 22–29: Actinomycetes	Nocardia
	Streptomyces
	Rhodococcus
III. Cell wall-less eubacteria: The mycoplasmas or mollicutes
Group 30: Mycoplasmas	Mycoplasma
	Ureaplasma
IV. Archaebacteria
Group 31: The methanogens	None
Group 32: Archaeal sulfate reducers	None
Group 33: Extremely halophilic archaebacteria	None
Group 34: Cell wall-less archaebacteria	None
Group 35: Extremely thermophilic and hyperthermophilic sulfur metabolizers	None