-
Obligate intracellular parasites
- Phylum: Preteobacteria
- Class: Alphaproteobacteria
- Order: Rickettsiales
- Genera: Rickettsia
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Pathogen of humans and other animals
- Phylum: Proteobacteria
- Class: Alphaproteobacteria
- Order: Rhizobiales
- Genera: Brucella
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Symbiotic of roots and legumes
- Phylum: Proteobacteria
- Class: Alphaproteobacteria
- Order: Rhizobiales
- Genera: Rhizbium
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Gonorrhea
- Phylum: Proteobacteria
- Class: Betaproteobacteria
- Order: Neisseriales
- Genera: Neisseria
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Serious opportunistic pathogen. Highly drug resistant
- Phylum: Proteobacteria
- Class: Gammaproteobacteria
- Order: Pseudomonadales
- Genera: Pseudomonas
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Normal intestinal flora, Opportunistic pathogens
- Phylum: Proteobacteria
- Class: Gammaproteobacteria
- Order: Enterobacteriales
- Genera: Escherichia, Klebsiella, Proteus
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Human pathogens
- Phylum: Proteobacteria
- Class: Gammaproteobacteria
- Order: Enterobacteriales
- Genera: Salmonella, Shigella, Yersinia
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Endospore-former, some are significant human pathogens. Obligate anaerobes
- Phylum: Frimicultes
- Order: Clostridiales
- Genera: Clostridium
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Some species in each genus are significant human pathogens
- Phylum: Firmicultes
- Order: Bacillales
- Genera: Bacillus, Listeria, Staphylococcus
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Tuberculosis and leprosy
- Phylum: Actinobacteria
- Order: Actinomycetales
- Genera: Mycobacterium
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Tuberculosis-like respiratory infections
- Phylum: Actinobacteria
- Order: Actinomycetales
- Genera: Nocardia
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Intracellular parasite, human pathogen
- Phylum: Chlamydiae
- Order: Chlamydiales
- Genera: Chlamydia
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Lyme disease
- Phylum: Spirochaetes
- Order: Spirochaetales
- Genera: Borrelia
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Syphillis
- Phylum: Spirochaetes
- Order: Spirochaetales
- Genera: Treponema
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