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- Facultative anaerobe or aerobic spore-forming usually Gram positive rods.
- See separate module for anthrax (B. anthracis).
- Ubiquitous in decayed organic matter and soil. Some species are part of normal human flora.
- Potential human pathogens include B. cereus, B. subtilis, B. megaterium, B. circulans, B. sphaericus.