ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Rosy Bala1 , Narinder Kaur1, Nitin Gupta2, Jyoti Chauhan1, Ritu Garg1, Harit Kumar1 and Adesh K Saini3
1Department of Microbiology, MM Institute of Medical Sciences & Research, MM Deemed to be University, Mullana, Ambala – 133 203, Haryana, India.
2Department of General Medicine, MM Institute of Medical Sciences & Research, MM Deemed to be University, Mullana, Ambala – 133 203, Haryana, India.
3Department of Biotechnology, Central Research Cell, Maharishi Markandeshwar (Deemed to be University), Mullana, Haryana, 133207, India.
J Pure Appl Microbiol. 2021;15(4):1957-1962 | Article Number: 7125 | © The Author(s). 2021
Received: 26/06/2021 | Accepted: 01/09/2021 | Published: 04/10/2021

The resistance to MLSB antibiotics, i.e. Macrolide-Lincosamide-Streptogramin B (MLSB), is an increasing problem among Methicillin-resistant Staphylococci. The resistance to macrolides can be by efflux mechanism or via inducible or constitutive resistance. Unfortunately, routine clindamycin susceptibility testing fails to detect the inducible resistance, which commonly results in treatment failure and necessitates incorporating a simple D-test to detect such resistance. A retrospective observational study was performed on S. aureus isolates from patients. The strains were subjected to antibiotic susceptibility testing followed by detection of mecA gene by a polymerase chain reaction and, the ‘D-test’ was performed to know the inducible resistance to clindamycin. A total of 235 isolates were identified as S. aureus. Antibiotic susceptibility test indicated 190 MRSA and 45 are sensitive to MLSB (MS). Inducible clindamycin resistance was found among 48 (20.4%) isolates and constitutive resistance in 104 (44.2%). MRSA strains had higher inducible and constitutive resistance than MSSA strains (22.1%, 51.6% and 13.3%, 13.3%, respectively). Clindamycin is a commonly used antibiotic in patients with MRSA infections to spare higher-end anti-MRSA antibiotics like linezolid and vancomycin. To detect inducible clindamycin to avoid treatment failures; the study showed the importance of incorporating the D-test in routine testing.


Antibiotic, Clindamycin, MRSA, Macrolide, Methicillin-resistant, Staphylococcus, rRNA methylase

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© The Author(s) 2021. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.