Bacillus cereus is a type of bacteria commonly found in soil, food, and the environment. It can cause foodborne illnesses, particularly when food is improperly stored or cooked. This bacterium produces toxins that can lead to two main types of illness: one causing nausea and vomiting, and the other resulting in diarrhea. Infections from Bacillus cereus are often linked to rice dishes, especially fried rice that has been kept warm for too long. Proper food handling and cooking practices can help prevent these illnesses, making it important to store leftovers correctly and reheat food thoroughly.