CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False colour scanning electron micrograph (SEM) of a small colony of the rod-shaped gram-negative bacteria Serratia marcescens, showing the characteristic convex curve of the end walls. Species of Serratia occur as commensal fauna in the intestinal mucous membranes of man & mammals. S. marcescens is occasionally pathogenic in humans, presenting in long term, chronically sick patients in whom they may cause septicaemia. Previous medical interest in Serratiasp. Magnification: X 5,800 at 35mm size.
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