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Escherichia coli
Escherichia coli Escherichia coli
Medium-sized grey colonies. The colonies have a characteristic odour.
The same Blood Agar plate examined with transmitted light. There is a zone of beta-haemolysis around the colonies.

The picture below is of another E. coli where there is no haemolytic zone around the colonies.

Click on the picture to see an enlarged version.
General characteristics: Gram-negative rods. Catalase-positive and oxidase-negative. Attacks sugars by fermentation and gas is produced. Motile. Mesophilic.
© Department of Veterinary Disease Biology 2011
Faculty of Health and Medical Sciences - University of Copenhagen