Bacillus cereus count*

Method References

FDA BAM 8th Edition, Chapter 14, 2001

Sample Size


Estimated Turn Around Time

48 hours. If presumptive colonies, additional 48 hours for confirmation.

Reporting Unit

cfu/sampled area

Method Description

Samples are prepared and dilutions made. Plated on selective media and incubated based on product type. Plates are then read, and results generated based on countable range.

Additional Information

Bacillus cereus is an aerobic spore-forming bacterium that is commonly found in soil, on vegetables, and in many raw and processed foods.
The MYP medium is used to help differentiate B. cereus from other bacteria based on the organism’s resistance to polymyxin, lack of mannitol fermentation and presence of lecithinase.  The absence of mannitol results in the agar changing to a pink-red color, and the presence of lecithinase creates the zone of precipitate surrounding the colony.

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