Detection of inducible clindamycin resistance in staphylococci by broth microdilution using erythromycin-clindamycin combination wells.

Journal Article (Journal Article;Multicenter Study)

A study conducted by 11 laboratories investigated the ability of four combinations of erythromycin (ERY) and clindamycin (CC) (ERY and CC at 4 and 0.5, 6 and 1, 8 and 1.5, and 0.5 and 2 microg/ml) in a single well of a broth microdilution panel to predict the presence of inducible CC resistance. Each laboratory tested approximately 30 Staphylococcus aureus isolates and 20 coagulase-negative staphylococcus (CoNS) isolates in a panel using cation-adjusted Mueller-Hinton broth from three different manufacturers. Only the strains resistant to ERY and those susceptible or intermediate to CC were included in the analysis (S. aureus, n = 333; CoNS, n = 97). Results of the D-zone test were used as the gold standard. After an 18-h incubation, the combination of 4 microg/ml ERY and 0.5 microg/ml CC performed the best, with 98 to 100% sensitivity and 100% specificity for both organism groups. After a 24-h incubation, the ERY-CC combinations of 4 and 0.5, 6 and 1, and 8 and 1.5 microg/ml correlated well with the D-zone test.

Full Text

Duke Authors

Cited Authors

  • Swenson, JM; Brasso, WB; Ferraro, MJ; Hardy, DJ; Knapp, CC; McDougal, LK; Reller, LB; Sader, HS; Shortridge, D; Skov, R; Weinstein, MP; Zimmer, BL; Patel, JB

Published Date

  • December 2007

Published In

Volume / Issue

  • 45 / 12

Start / End Page

  • 3954 - 3957

PubMed ID

  • 17942655

Pubmed Central ID

  • PMC2168576

International Standard Serial Number (ISSN)

  • 0095-1137

Digital Object Identifier (DOI)

  • 10.1128/JCM.01501-07


  • eng

Conference Location

  • United States