Molecular characterization of community- & hospital-acquired methicillin-resistant & methicillin-sensitive Staphylococcus aureus isolates in Sikkim.

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dc.contributor.authorBhutia, Kunsang Ongmoo
dc.contributor.authorSingh, T S K
dc.contributor.authorAdhikari, Luna
dc.contributor.authorBiswas, Shilpie
dc.date.accessioned2016-01-11T11:43:11Z
dc.date.available2016-01-11T11:43:11Z
dc.date.issued2015-09
dc.description.abstractBackground & objectives: The two major genotypic markers that distinguish community acquired (CA) from hospital acquired (HA) methicillin resistant staphylococcus aureus (MRSA) isolates are the architecture of mobile genetic element (SCCmec type) and presence of panton valentine leukocidin (PVL) toxin. This study was conducted to determine the molecular characteristics of CA- and HA- MRSA and methicillin sensitive S. aureus (MSSA) isolates in Sikkim. Methods: A total of 150 clinical isolates of S. aureus isolated from various clinical specimens were subjected to duplex (mec-A and pvl gene) and multiplex (SCCmec typing) PCR. Results: of the 150 isolates, 53 (35.33%) and 66 (44%) were positive for mec-A (MRSA) and pvl genes, respectively. Thirty eight (25.33%) met the definition of CA-MRSA and 15 (10%) of HA-MRSA and the remaining 63 (42%) and 34 (22.66%) as CA- and HA-MSSA, respectively. No significant difference was seen in the distribution of PVL toxin in MRSA and MSSA isolates, but it was significantly (P<0.001) high in overall MRSA isolates than in MSSA. The majority of the MRSA isolates showed a double amplification band of SCCmec type III plus V (54.71%), and only a fewer isolates were amplified by single DNA fragments of type I (1.88%), III (3.77%), IVa (1.88%) and V (11.32%). SCCmec types I, III, IVa, were found only in HA-MRSA isolates, whereas type V in both the CA- and HA-MRSA. AST pattern showed that 18.42 per cent (7/38) and 46.66 per cent (7/15) were multidrug resistant (MDR)-CA-MRSA and MDR-HA-MRSA, respectively. Interpretation & conclusions: The present results show that SCCmec type V MRSA has been on the rise, and genotypic markers such as pvl gene detection used for the differentiation of these clinically distinct isolates of MRSA may not be reliable.en_US
dc.identifier.citationBhutia Kunsang Ongmoo, Singh T S K, Adhikari Luna, Biswas Shilpie. Molecular characterization of community- & hospital-acquired methicillin-resistant & methicillin-sensitive Staphylococcus aureus isolates in Sikkim. Indian Journal of Medical Research. 2015 Sept; 142(3): 330-335.en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/170316
dc.language.isoenen_US
dc.source.urihttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4669869/en_US
dc.subjectCA-MRSAen_US
dc.subjectCA-MSSAen_US
dc.subjectHA-MRSAen_US
dc.subjectHA-MSSAen_US
dc.subjectpvl geneen_US
dc.subjectSCCmec elementen_US
dc.titleMolecular characterization of community- & hospital-acquired methicillin-resistant & methicillin-sensitive Staphylococcus aureus isolates in Sikkim.en_US
dc.typeArticleen_US
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