DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Salmonella enteritidis bacteria. Coloured scanning electron micrograph (SEM) of several Salmonella enteritidis bacteria. These Gram-negative rod- shaped bacteria are present in human and animal intestinal tracts. They can cause food poisoning in humans by producing toxins that act on the small intestine. Infection occurs when numbers of these bacteria are ingested in contaminated food, particularly meat, milk and chicken eggs. Symptoms include vomiting, abdominal pain and diarrhoea. The infection is controllable and is rarely fatal. Magnification: x6,350 at 6x7cm size.
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