D test for antibiotic sensitivity

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Procedure

Methicillin-resistant Staphylococcus aureus (MRSA) strain is cultured with erythromycin & clindamycin.
It is positive when the MRSA is resistant to erythromycin & resistance to clindamycin is inducible.
In this case, the bacterial growth pattern around the clindamycin looks like a 'D'.

↑ Prescriber's Letter 12(7): 2005 Trimethoprim-Sulfamethoxazole (TMP-SMX) for Community-Acquired Methicillin-Resistant Staphylococcus aureus Detail-Document#: http://prescribersletter.com/(5bhgn1a4ni4cyp2tvybwfh55)/pl/ArticleDD.aspx?li=1&st=1&cs=&s=PRL&pt=3&fpt=25&dd=210710&pb=PRL (subscription needed) http://www.prescribersletter.com