Discussion
Which of the following microbe does not belong to Group D enterococci group?
Answer: D
Correct answer: S. bovis
S. bovis carries the group D antigen but is not an enterococcus: it fails to grow in 6.5 per cent salt and remains bile-aesculin positive, so it is distinguished from the true enterococci by the salt test. The distinction has clinical value, since S. bovis bacteraemia and endocarditis are associated with colonic carcinoma and prompt a search for one.
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