E. GRAY / SCIENCE PHOTO LIBRARY E. GRAY / SCIENCE PHOTO LIBRARY
E. coli bacteria. Coloured transmission electron micrograph of a colony of Escherichia coli, a rod- shaped, Gram-negative species of bacteria. Some of the cells are dividing into pairs of "daughters". E. coli is a normal inhabitant of the human intestine and is usually harmless. Under certain conditions its numbers may increase and cause infection. Some strains are responsible for gastroenteritis in children, particularly in tropical countries. In adults it is the cause of "traveller's diarrhoea" and of 80% of all urinary tract infections. It is also the organism most used in genetic studies. Magnification x2,400 at 6x4.5cm size.
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