Antimicrobial susceptibility pattern of Staphylococcus aureus isolates from mutton marketed in Chennai, India

Title: Antimicrobial susceptibility pattern of Staphylococcus aureus isolates from mutton marketed in Chennai, India

Authors: S Wilfred Ruban, R Narendra Babu, K Porteen, TMA Senthilkumar, P Raja, P Kumarasamy, C Ramakrishnan and Robinson JJ Abraham

Source: Ruminant Science (2017)-6(1):145-148.

Cite this reference as: Ruban S Wilfred, Babu R Narendra, Porteen K, Senthilkumar TMA, Raja P, Kumarasamy P, Ramakrishnan C and Abraham Robinson JJ (2017). Antimicrobial susceptibility pattern of Staphylococcus aureus isolates from mutton marketed in Chennai, India. Ruminant Science 6(1):145-148.



The present study was carried out to evaluate the antimicrobial susceptibility pattern of S. aureus isolates from 60 mutton samples marketed in retail outlets of Chennai, India against 16 commonly used antibiotics in human and animals. In total 40 S. aureus was isolated in the present study. All the 40 isolates were resistant to both Ampicillin and Tetracycline (100%) followed by Novobiocin (92.50%), Amoxicillin (82.50%) and Erythromycin and Polymyxin- B (75.00%). The isolates were highly sensitive to Neomycin (90%) followed by Kanamycin (85%), Vancomycin (77.50%), Chloramphenicol (75.00%), Oxacillin (60.00%) and Cefoxitin (57.50%). In addition, 50 per cent of the isolates were sensitivity towards Gentamicin, Co-trimazole and Ciprofloxacin. In the present study, the occurrence of methicillin resistance S. aureus (MRSA) observed was 40.00 (16/40) per cent based on Cefoxitin disc diffusion assay and confirmed by mecA PCR. The MAR index of mutton isolates (n=40) revealed that, all the 40 isolates including 16 MRSA and 24 MSSA had MAR index of 0.3 and above. None of the isolates had MAR index of 0.2 or below. The results clearly indicated prevalence of multidrug resistance among the isolates indicating its potential public health importance to the consumers.


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