Abstract:
BACKGROUND:Methicillin-resistant Staphylococcus aureus (MRSA) continues to be a major cause of nosocomial infections. Methicillin resistance in S. aureus is caused by the acquisition of the mecA gene, located on a mobile genetic element called the staphylococcal cassette chromosome (SCC). OBJECTIVES:The aim of this study was to evaluate the presence of the predominant SCCmec type present among clinical isolates. MATERIALS AND METHODS:This cross-sectional study was performed on a total of 146 MRSA isolates obtained from clinical specimens between 2012 and 2013 from two major hospitals in Shiraz, Southwest of Iran. Antibiotic susceptibility profiles were determined by the disc diffusion method according to the guidelines of The Clinical and Laboratory Standards Institute. Bacterial DNA was extracted using the small-scale phenol-chloroform extraction method and was employed as polymerase chain reaction (PCR) templates for the assigned current SCCmec types. RESULTS:The assigned SCCmec types by PCR revealed the SCCmec type I as the predominant type with 86 (58.9%) samples, followed by the SCCmec type II with 29 (19.9%), type III with 16 (11.0%), and type IV with 12 (8.2%) samples, respectively. The SCCmec type I MRSA isolates were significantly recovered from blood (80%) and sputum (67.2%). The results of antibacterial susceptibility tests for the MRSA isolates showed that all of those carrying the SCCmec type I and II had significantly greater resistance rates to Gentamicin and Rifampin than the isolates containing the SCCmec type III. Also, a significant difference was detected for susceptibility to Co-trimoxazole between the SCCmec type I and II MRSA isolates and the SCCmec type III, which was more resistant. CONCLUSIONS:The frequency of the isolates containing type I in the current study can indicate an emergence of this SCCmec type in the studied medical centers.
journal_name
Jundishapur J Microbioljournal_title
Jundishapur journal of microbiologyauthors
Ebrahim-Saraie HS,Motamedifar M,Sarvari J,Hoseini Alfatemi SMdoi
10.5812/jjm.16998v2subject
Has Abstractpub_date
2015-06-27 00:00:00pages
e16998issue
6eissn
2008-3645issn
2008-4161journal_volume
8pub_type
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