STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Bacillus cereus. Coloured scanning electron micrograph (SEM) of Bacillus cereus a Gram-positive, encapsulated, rod prokaryote that causes food poisoning and diarrhoea. It is a motile, beta haemolytic bacterium commonly found in soil and food. Some strains are harmful to humans and cause foodborne illness. Other strains can be beneficial as probiotics for animals. It is the cause of fried rice syndrome, as the bacteria are classically contracted from fried rice dishes that have been sitting at room temperature for hours. B. cereus bacteria are facultative anaerobes, and like other members of the genus Bacillus, can produce protective endospores. Magnification: x1250 when printed at 10 cm wide.
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