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http://dx.doi.org/10.13103/JFHS.2014.29.3.223

Prevalence and Molecular Characterization of Methicillin Resistant Staphylococcus aureus Isolated from Raw Milk Samples in Gyeonggi-do, Korea  

Kang, SoWon (Division of Animal Science, Sahmyook University)
Song, YoungCheon (College of Pharmacy, Sahmyook University)
Choi, SungSook (College of Pharmacy, Sahmyook University)
Publication Information
Journal of Food Hygiene and Safety / v.29, no.3, 2014 , pp. 223-227 More about this Journal
Abstract
This study was investigated to determine the prevalence of methicillin-resistant Staphylococcus aureus (MRSA) isolated from raw milk samples and to further study on the molecular characteristics of the MRSA isolates. Using Staphylococcus Medium 110, Staphylococcus spp. were isolated from raw milk samples and further identification was carried by Vitek2 system. Minimum inhibitory concentrations (MICs) of antibiotics were conducted by serial dilution method according to the Clinical Laboratory Standards Institute (CLSI) guideline. For the detection of resistance genes and molecular characterization, PCR reaction was performed by gene specific primers and followed by DNA sequencing. Of the 698 milk samples, 94 Staphylococcus aureus (S. aureus) were identified (94 S. aureus/286 Staphylococcus spp.). Of the 94 S. aureus, seven isolates have mecA, a methicillin resistant gene. mecA positive seven isolates were then characterized by staphylococcal cassette chromosome mec (SCCmec) typing, and Panton-Valentine Leukocidin (pvl) gene using PCR. All of mecA positive isolates were resistant to ampicillin and oxacillin, but sensitive to teicoplanin, vancomycin and ciprofloxacin. One of seven isolates was SCCmec type II and six isolates were type IV and all seven isolates were pvl gene negative.
Keywords
methicillin-resistant Staphylococcus aureus; molecular characteristics of mecA; SSCmec typing; pvl;
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