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'D-zone' clue key to clindamycin-resistant MRSA: test inducible resistance.(Clinical Rounds)

OB GYN News

| November 01, 2003 | Finn, Robert | COPYRIGHT 2003 International Medical News Group. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

ASPEN, COLO. -- Physicians should make sure their microbiology lab is testing for both inducible and constitutive resistance to clindamydn when they send samples for susceptibility testing, Dr. Carol J. Baker said at a conference on pediatric infectious diseases sponsored by Children's Hospital, Denver.

With the rise in methicillin-resistant Staphylococcus aureus (MRSA), susceptibility testing has become routine. But unless the lab takes special care, the report may say that the patient's S. aureus is susceptible to clindamycin when actually it is not,

In constitutive resistance, the microbe is. clearly resistant to both erythromycin and clindamycin, and the lab will be able to pick this up using any susceptibility test, she explained at the meeting, which was also sponsored by the University of Colorado.

The problem is with inducible resistance. During ordinary testing, the microbe appears to be resistant to erythromycin and susceptible to clindamycin, but once the patient is ...

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