Lab 6 - Gram + bacteria: Staphylococcus and Bacillus

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Last updated 5:19 AM on 6/8/26
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What gastrointestinal illnesses does Bacillus cereus (spore former) pose?

  • Emetic type - toxin is produced by growing cells in the food

    • 0.5-5 hours of incubation, and symptoms can last up to 24 hours

  • Diarrheal type - enterotoxins produced during vegetative growth of B. cereus in the small intestine

    • 8-16 hours of incubation, and symptoms last for up to 24 hours

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Staphylococcus aureus (non-spore-forming)

  • Multi-drug resistant - difficult to get rid of in hospitals

  • “Super bug”

  • Found on skin and nasal passages

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What is added to Baird-Parker (BP) agar?

  • Tellurite - to separate S. aureus from other lecithinase-positive strains by giving S. aureus BLACK color

  • Glycine and lithium chloride - have inhibitory action for microorganisms other than S. aureus

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