Detection of inducible clindamycin resistance in staphylococci by broth microdilution using erythromycin-clindamycin combination wells.
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.
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- Staphylococcus
- Sensitivity and Specificity
- Microbiology
- Microbial Sensitivity Tests
- Gene Expression Regulation
- Erythromycin
- Drug Resistance, Bacterial
- Culture Media
- Clindamycin
- Anti-Bacterial Agents
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Staphylococcus
- Sensitivity and Specificity
- Microbiology
- Microbial Sensitivity Tests
- Gene Expression Regulation
- Erythromycin
- Drug Resistance, Bacterial
- Culture Media
- Clindamycin
- Anti-Bacterial Agents