Prevalence of MLSB Phenotypes of Staphylococcus aureus isolates in a tertiary care hospital of Delhi

Against the backdrop of the ever-changing Staphylococcal resistance pattern, clindamycin remains a viable therapeutic alternative Variation of Clindamycin drug resistance patterns with geographic area make inducible clindamycin resistance testing imperative for all staphylococcal isolates to avoid therapeutic failure. This was a prospective study conducted over a period of 1.5 years from January 2021 until June 2022. Prevalence of different MLS_B Phenotypes of Staphylococcus aureus isolates was determined by standard disc diffusion method as per CLSI guidelines. Pyogenic samples received in the Microbiology lab that yielded Staphylococcus aureus were further tested for the presence of clindamycin resistance by disc diffusion method. Out of 6586 total pyogenic and respiratory specimens received in the lab, Staphylococcus aureus was yielded in 752 samples. On further testing for the MLS_B phenotypes, 16.3% isolates were found to be iMLS_B, 19.28% were cMLSB, 43.1% were of MS_B type. ICR screening will reduce the unessential subjection of the patient to the antibiotic, and would prevent unnecessary adverse effects in the patients.