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PREVALENCE OF METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS (MRSA) IN A TERTIARY CARE HOSPITAL AND SIGNIFICANCE OF LINCOSAMIDE SUSCEPTIBILITY IN MACROLIDE RESISTANT MRSA.

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Abstract (2. Language): 
Context: Methicillin resistant Staphylococcus aureus (MRSA), specifically multiple drug resistant MRSA, are a real threat to the clinician and therapeutic option for these isolates has to be worked out. Objective: The objective of the present study was to assess the prevalence of MRSA in our hospital and further to identify inducible resistance to macrolides (erythromycin) among these MRSA, for therapeutic purpose. Setting and Design: This study was conducted over a period of three years. The clinical samples received from the patients admitted in various ICU’s and wards of Dayan and Medical College & Hospital, Ludhiana, were included in the study. Material and Method: MRSA were detected using 1 μg disc of oxacallin. Two hundred thirty five MRSA which were erythromycin (macrolide) non susceptible but clindamycin susceptible, were tested using 15 mm disc approximation test (D-test) to evaluate erythromycin inducible (ermmediated) and non-inducible (msrA mediated) resistance. Results: prevalence of MRSA was found to be Out of 235 MRSA tested using D test, 51/235 (21.8%) showed negative D test and resistant to erythromycin in these isolate may be mediated by msrA genes. Conclusion: MRSA isolates with negative D-test will not develop resistance during the treatment with lincosamides. Patients with infection caused by multiple drug resistance MRSA with msrA genes may be treated with lincosamides without any fear of developing resistance and clindamycin may be kept as a reserve drug in severe MRSA infections or in cases where the patient is known to have hypersensitivity to β-lactam drugs, depending upon the results of the D-test.
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