What is the diagnostic threshold for Bacillus cereus in food?

• A. ≥10 organisms/g
• B. ≥100,000 organisms/g
• C. ≥1,000,000 organisms/g
• D. ≥10,000 organisms/g

Answer: (B)

The idea being tested is the bacterial load at which Bacillus cereus becomes a health risk in food. Bacillus cereus can produce toxins, and the chance of illness rises as the number of organisms in a food sample increases, especially if the food is kept at temperatures that allow growth. In many food safety guidelines, about 100,000 organisms per gram (10^5 CFU/g) is the threshold used to indicate a hazardous level where illness becomes likely. So finding at least 100,000 organisms per gram suggests a potential risk and aligns with this commonly cited diagnostic cutoff. Lower counts might be less likely to cause illness, though certain foods or toxin formation conditions can still pose a risk, while much higher counts imply an even greater likelihood of harm.