Bacillus cereus

Definition

Bacillus cereus is a Gram-positive, rod-shaped bacterium found in soil and food. It is known for causing foodborne illnesses and can produce toxins leading to gastrointestinal infections.

5 Must Know Facts For Your Next Test

1. Bacillus cereus is capable of forming heat-resistant endospores, making it difficult to eliminate through cooking.
2. It produces two types of toxins: emetic (vomiting) toxin and diarrheal toxin, each causing different symptoms.
3. Common sources of Bacillus cereus contamination include rice, pasta, meats, and dairy products.
4. The bacterium can grow at a wide range of temperatures, from 4°C to 55°C, which contributes to its persistence in various environments.
5. Proper food handling and storage are essential in preventing Bacillus cereus infections.

Review Questions

• What are the two types of toxins produced by Bacillus cereus and their associated symptoms?
• How does Bacillus cereus survive cooking processes that typically kill other bacteria?
• Why is proper food handling crucial in preventing Bacillus cereus infections?

Related terms

Endospore:

A resistant asexual spore that develops inside some bacteria cells.

Gram-Positive Bacteria: Bacteria that have a thick peptidoglycan cell wall which retains the crystal violet stain used in the Gram staining method.

Foodborne Illness: Infections or intoxications caused by consuming contaminated food or beverages.