False-colour transmission electron micrograph of a colony of bacteria, Salmonella enteritidis, cause of a severe outbreak of food poisoning in Britain in 1988. The outbreak was traced to chicken eggs containing the bacteria. Chickens are associated with Salmonella, but until recently it has been the less virulent species of S. typhimurium, which lives in the gut of the chicken & is not found in the reproductory system. S. enteritidis is thought to have entered Britain in imported chicken feed. Magnification: x4700 at 6x4.
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