Antibiotic resistance and molecular epidemiology characteristics of methicillin-resistant Staphylococcus aureus in Shenzhen area / 中国人兽共患病学报

ABSTRACT

The aim of this study is to investigate antibiotic resistance and molecular epidemiology characteristics of methicillin-resistant Staphylococcus aureus (MRSA) in Shenzhen area.We collected 428 Staphylococcus aureus isolates from eight hospitals in Shenzhen in 2012.According to the results of minimum inhibitory concentration (MIC) to cefoxitin,26.2％ of Staphylococcus aureus isolates (112/428) were identified as MRSA.The MIC of 10 antimicrobial agents was determined by agar dilution method.Panton-Valentine leucocidin(PVL) was detected by polymerase chain reaction(PCR).Positive strains of PVL were detected by multilocus sequence typing(MLST).Among the 112 strains,the resistance rates to trimethoprim-sulfamethoxazole,moxifloxacin,ciprofloxacin,gentamicin,erythromycin,clindamycin and tetracycline were 4.46％,12.50％,16.96％,19.64％,46.42％,25.00％ and 26.79％ respectively.No isolates resistant to vancomycin,linezolid and teicoplanin were found.Among the 112 strains,there were 13 (11.61％) strains carried PVL gene.There were no significant differences in the resistance rates of PVL positive strains and negative strains to 10 kinds of antimicrobial agents.Among the 13 strains carried PVL gene,7 kinds of old sequences and 1 kind of new sequence type were found by MLST.ST338 and ST25 were the most common type.All the data indicate that surveillance of MRSA in Shenzhen has a distinct genetic background from other regions.