Molecular characterization of methicillin-resistant Staphylococcus aureus: characterization of major clones and emergence of epidemic clones of sequence type (ST) 36 and ST 121 in Tehran, Iran

FEMS Microbiology Letters
Solmaz Ohadian MoghadamHooman Sadighian

Abstract

Information about the molecular structure of MRSA strains provides significant insights into the epidemiology of this important pathogen. To investigate the molecular characteristics of MRSA isolates, MRSA isolates were subjected to molecular typing by means of spa typing, multilocus sequence typing, Staphylococcal Cassette Chromosome mec (SCCmec) grouping and to phenotypic antimicrobial susceptibility testing by means of disk diffusion assay. Then the presence of pvl genes was evaluated. Cluster analysis by eBURSTv3 showed that MRSA isolates belonged to two major clonal complexes (CC); CC8 (ST239, ST585, ST2732, ST1294) and CC30 (ST30, ST36, ST1163) and four singletons. Subsequent analysis of MRSA isolates revealed that the most prevalent SCCmec type was type III (55.8%) followed by type IV (34.9%) and type II (2.3%). Totally 11 different spa types were discriminated among which types t037 and t030 were predominant. The prevalence of Panton-Valentine leukocidin (PVL)-positive MRSA strains was high (20%), which is a matter of great concern, because the PVL is frequently associated with severe and recurrent SSTIs. ST239-III- t037 represented the most predominant MRSA clone. The presence of sequence type (ST) 36 and ST 121 are be...Continue Reading

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Citations

Dec 29, 2015·APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica·Najmeh ParhizgariMahmood Naraki
Jun 6, 2016·European Journal of Clinical Microbiology & Infectious Diseases : Official Publication of the European Society of Clinical Microbiology·S MadzgallaS Monecke
Jul 25, 2017·APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica·Mohammad Hossein SobhanipoorFereshteh Saffari

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