Antibiotic Producers: B. brevis (e.g. gramicidin, tyrothricin), B. cereus (e.g. cerexin, zwittermicin), B. circulans (e.g. circulin), B. laterosporus (e.g. laterosporin), B. licheniformis (e.g. bacitracin), B. polymyxa (e.g. polymyxin, colistin), B. pumilus (e.g. pumulin) B. subtilis (e.g. polymyxin, difficidin, subtilin, mycobacillin).
Pathogens of Insects: B. larvae, B. lentimorbis, and B. popilliae are invasive pathogens. B. thuringiensis forms a parasporal crystal that is toxic to beetles.
Pathogens of Animals: B. anthracis, and B. cereus. B. alvei, B. megaterium, B. coagulans, B. laterosporus, B. subtilis, B. sphaericus, B. circulans, B. brevis, B. licheniformis, B. macerans, B. pumilus, and B. thuringiensis have been isolated from human infections.
The Genus Bacillus includes two bacteria of significant medical importance, B. anthracis, the causative agent of anthrax, and B. cereus, which causes food poisoning. Nonanthrax Bacillus species can also cause a wide variety of other infections, and they are being recognized with increasing frequency as pathogens in humans.