CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph (TEM) of a colony of Staphylococcus aureus, a species of spherical, Gram positive, non-motile bacteria. Many species of Staphylococcus cause disease in man through secretion of exotoxins: S. aureus is commonly present on skin and mucous membranes and causes boils and internal abscesses, and is the commonest cause of pyogenic (pus-forming) infections in man. Other species produce toxins causing food poisoning. Staphylococcal enteritis (severe & potentially fatal) results from use of broad-spectrum antibiotics which allows S. aureus to proliferate in the intestines. Magnification: X 12,000 at 35mm size.
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