The Bacillus cereus group include B. anthracis, B. cereus, B. mycoides, B. pseudomycoides B. thuringiensis and B. weihenstephanensis. Unlike the other members of the B. cereus group, B. anthracis is non-motile and non-haemolytic on horse (or sheep’s) blood agar, grows at 37°C, and forms typical grey/white flat colonies with bee’s eye appearance (that is, oval, slightly granular but not dry, about 2- 5mm in diameter) with irregular edges, which are characteristically tacky on teasing with a loop.