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Bacillus anthracis is the pathogen that causes anthrax Originally known as an important animal pathogen, it was the first bacterium to be used for the preparation of a vaccine based on attenuated bacteria by Louis Pasteur in 1881.
From Wikipedia, the free encyclopedia. Bacillus subtilis, known also as the hay bacillus or grass bacillus, is a Gram-positive, catalase-positive bacterium, found in soil and the gastrointestinal tract of ruminants and humans.s other members of the genus Bacillus, it can form an endospore, to survive extreme environmental conditions of temperature and desiccation. B. subtilis is a facultative anaerobe and had been considered as an obligate aerobe until 1998.