Prevalence of Constitutive and Inducible Clindamycin Resistance among Methicillin-Resistant Staphylococcus aureus Isolates in a Tertiary Care Hospital, Kashmir Valley

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JR_JMMI-10-3_002

تاریخ نمایه سازی: 29 بهمن 1402

Abstract:

Introduction: The increased frequency of Methicillin-resistant Staphylococcus aureus infections has led to renewed interest in the macrolide-lincosamide streptogramin B (MLS) group of antibiotics. Resistance to these antibiotics may be constitutive or inducible. Isolates resistant to erythromycin may show false in vitro susceptibility to clindamycin, leading to therapeutic failures. This study investigated the utility of the D-Test for detecting inducible clindamycin resistance in methicillin-resistant S. aureus isolates and determining the prevalence of various phenotypes in our region. Methods: For detecting inducible clindamycin resistance, a D-test using erythromycin and clindamycin as per CLSI guidelines was performed, and four different phenotypes were interpreted as methicillin-sensitive (MS) phenotype (D-test negative), inducible MLSB (iMLSB) phenotype (D-test positive), constitutive MLSB phenotype and sensitive to both. Results: Of the ۹۸۷ isolates tested, ۴۰۰ (۴۰.۵۳%) were MRSA. The prevalence of iMLSB, cMLSB phenotype, MS phenotype and sensitive phenotype in MRSA isolates was ۴۲.۵%, ۱۰.۵%, ۲۸% and ۱۹%, respectively. The iMLSB and cMLSB phenotypes were higher in males (۲۴.۷۵%, ۶.۲۵%) than females (P-value = ۰.۱۳۷). The majority of MRSA isolates originated from pus (۸۳%). All S. aureus isolates showed ۱۰۰% sensitivity to vancomycin and linezolid.  Conclusion: This study emphasizes the prevalence of inducible clindamycin resistance in MRSA in our setup. Incorporating the D-test into the routine Kirby–Bauer disk diffusion method in clinical microbiology laboratories will help clinicians make judicious use of clindamycin, minimizing treatment failure.

Authors

Shahida Akhter

Department of Microbiology, Government Medical College, Srinagar, India

Asifa Nazir

Department of Microbiology, Government Medical College, Srinagar, India

Ovais Karnain

Department of Microbiology, Government Medical College, Srinagar, India

Mariya Rouf

Department of Microbiology, Government Medical College, Srinagar, India

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