JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Bacteria colony. Illustration of a colony of Staphylococcus aureus, a species of spherical, Gram positive, non-motile bacteria. Typically this bacteria is found in grape-like clusters. In the foreground, one bacterium is cut through to show: cell wall (outer purple), plasma membrane (white line), nucleoid of genetic material (purple), and granules in the cytoplasm (red). Staphylococcus species secrete exotoxins and many cause disease in humans: S. aureus is found on skin and mucous membranes. It causes boils and internal abscesses, and is the commonest cause of pyogenic (pus- forming) infections. Sometimes present harmlessly in the body, treatment is with antibiotic drugs.
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