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Bacillus cereus

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Microbiology

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.

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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?

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