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Enterococcus faecalis
Enterococcus faecalis Enterococcus faecalis
Pinpoint to small, smooth, entire colonies.
The same Blood Agar plate examined with transmitted light. There is a narrow green zone around the colonies. This 'greening' is caused by the accumulation of hydrogen peroxide converting the haemoglobin to methaemoglobin in the agar. Sometimes the 'greening' may be absent because the bacterium can produce pseudocatalase.
General characteristics: Gram-positive cocci in short chains. Catalase-negative, but may show a catalase-positive reaction when grown on Blood Agar. Attacks sugars fermentatively. Microaerophilic. Usually non-motile.
© Department of Veterinary Disease Biology 2011
Faculty of Health and Medical Sciences - University of Copenhagen