BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Escherichia coli. Coloured scanning electron micrograph (SEM) of a colony of Escherichia coli, a gram-negative bacilli (rod-shaped) bacteria. E. coli is a normal inhabitant of the human intestine and is usually harmless. Under certain conditions however, 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 most urinary tract infections, such as cystitis. E. coli is widely used in genetic studies and for genetic engineering. Magnification unknown.
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