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Updated: Jun 21, 2026
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
Detection of inducible clindamycin resistance in staphylococci by disk diffusion induction test
Sureerat Chelae1, Varaporn Laohaprertthisarn, Manthana Phengmak
1Microbiology Unit, Department of Pathology, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand. jsureera@medicine.psu.ac.th
Objective:
To detect inducible clindamycin (CL) resistance in staphylococci by disk diffusion induction test (D-test).
Material And Method:
One thousand one hundred eighty clinical isolates of staphylococci were tested for inducible CL resistance by placing erythromycin (E) disk and clindamycin disk 12 mm apart (edge to edge) on Mueller-Hinton agar plate inoculated with staphylococci. The flattening of CL zone (D-shaped zone) near E disk indicated an inducible CL resistance was observed after 18-24 h of incubation.
Results:
Inducible CL resistance was detected in 9.9% of staphylococci isolates. It was found in methicillin-resistant Staphylococcus aureus (MRSA) more than methicillin-sensitive Staphylococcus aureus (MSSA) and coagulase-negative staphylococci (CoNS) 35.9%, 4.7%, and 5.5%, respectively.
Conclusion:
To avoid misinterpretation of CL result, D-test is recommended for routine detecting of inducible CL resistance in staphylococci. It provides the confident laboratory report of CL as resistant (D-shaped zone positive) or as susceptible (D-shaped zone negative) particular for E resistant isolates.
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