BSIP / SCIENCE PHOTO LIBRARY BSIP / SCIENCE PHOTO LIBRARY
Staphylococcus sp. False-colour scanning electron micrograph (SEM) of a colony of the spherical genus of bacteria, Staphylococcus sp. These Gram- positive bacteria appear in groups that resemble clusters of grapes (as here), but are also observed individually, in pairs or in short chains. They are significant human pathogens, causing diseases ranging from superficial skin infections (boils, abscesses) to life-threatening systemic illness (pneumonia, food poisoning, infectious arthritis and bacterial endocarditis). Of the large number of species, three are commonly associated with human disease: S. aureus, S. epidermidis and S. saprophyticus.
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