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ORIGINAL ARTICLE
Year : 2016  |  Volume : 5  |  Issue : 2  |  Page : 111-114

Inducible clindamycin resistance among the clinical isolates of Staphylococcus aureus in a tertiary care hospital


1 Department of Pharmacology, SS Medical College, Rewa, Madhya Pradesh, India
2 Department of Microbiology, JIIU's n Institute of Medical Science and Research, Medical College and Noor Hospital, Jalna, Maharashtra, India
3 Department of Microbiology, CHL Apollo Hospital, Indore, Madhya Pradesh, India
4 Department of Microbiology, Sri Aurobindo Institute of Medical Sciences Medical College and PG Institute, Indore, Madhya Pradesh, India

Correspondence Address:
Trupti Bajpai
Department of Microbiology, Sri Aurobindo Institute of Medical Sciences Medical College and PG Institute, MR.10 Crossing, Indore-Ujjain Highway, Indore, Madhya Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2278-344X.180428

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Introduction: Clindamycin is commonly used to treat skin and soft tissue infections caused by Staphylococcus aureus particularly in methicillin-resistant S. aureus (MRSA) infections. Inducible clindamycin resistance (inducible macrolide–lincosamide–streptogramin B resistance [MLSB]) is a critical factor in antimicrobial susceptibility testing. This study was aimed to detect MLSB phenotypes and inducible clindamycin resistant phenotypes among S. aureus. Materials and Methods: A total of 649 S. aureus isolates from different clinical samples were evaluated, and methicillin-resistance was determined using the cefoxitin (30 μg) disc. Inducible resistance to clindamycin was detected by D-zone test as per Clinical and Laboratory Standards Institute guidelines. Results: Of the 649 isolates, 404 (62.2%) were methicillin-sensitive S. aureus (MSSA) and 245 (37.8%) were MRSA. Ninety-six (14.8%) isolates showed inducible clindamycin resistance, 175 (27%) showed constitutive resistance, and 55 (8.5%) isolates showed MS phenotype. Inducible and constitutive resistance phenotypes were found to be higher in MRSA (25% and 64.8%) as compared to MSSA (8.7% and 4.7%), respectively. Conclusions: Considering the higher prevalence of clindamycin resistance in MRSA isolates as compared MSSA isolates, routine D-test of MRSA isolates is strongly recommended to prevent treatment failure. Therefore, inducible clindamycin detection should be the part of S. aureus sensitivity testing in all the microbiology laboratories.


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