bacillus badius bacillus badius bacillus badius is a gram-positive aerobic spore-forming bacillus. originally isolated from human intestines and described in 1919, b. badius was later found in a sample of figs. novel enzymes, including a restriction enzyme and penicillin g acylase, have been purified from this bacterial species. bacillus badius scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: bacillus species: b. badius binomial name bacillus badiusbatchelor, 1919