The Bacillus cereus reference article from the English Wikipedia on 24-Apr-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Bacillus cereus

Have you considered sponsoring a child
Bacillus cereus is a Gram- & catalase-positivepositive, spore-forming facultative anaerobic rod-shaped bacteria.

It is a cause of foodborne illness, and is particularly noted for doing so in rice. During high-temperature cooking, bacilli that have contaminated the uncooked rice reproduce, then form protective spores when the rice cools. On rewarming, the spores germinate and, when the rice is eaten, can cause severe diarrhea, vomiting, and abdominal cramps.

This can be prevented by proper food handling techniques.