Bacillus cereus is an aerobic spore-forming bacterium that is commonly found in soil, on vegetables, and in many raw and processed foods. B. cereus food poisoning may occur when foods are prepared and held without adequate refrigeration for several hours before serving, with B. cereus 6 cells/g.Foods incriminated in past outbreaks include cooked meat and vegetables, boiled or fried rice, vanilla sauce, custards, soups, and raw vegetable sprouts.ests for differentiating members of the B. cereus group (Table 1). The following tests are useful for differentiating typical strains of B. cereus from other members of the B. cereus group, including B. mycoides, B. thuringiensis, and B. anthracis also non-motile.