A D-Test Is Set Up on a S

question 33

Multiple Choice

A D-test is set up on a S.aureus isolate.There was no zone around the Erythromycin disk and the zone of inhibition around the clindamycin disk adjacent to the erythromycin disk was interpreted as susceptible.Thus,the resistance mechanism for the erythromycin is due to:

• A)altered target.
• B)increased efflux.
• C)decreased porin channels.
• D)degradative enzymes.

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