Antimicrobial resistance and virulence genes profiling of methicillin-resistant Staphylococcus aureus isolates in a burn center: A 5-year study.
Methicillin-resistant S. aureus (MRSA) has attracted more and more attention in recent years, especially in burn medical centers. Here we conducted a 5-year period study to evaluate the MRSA infection in our burn center. The staphylococcal chromosomal cassette mec (SCCmec) typing, antimicrobials susceptibility and virulence profiles were also performed among the MRSA isolates. Of the 259 S. aureus isolates, 239 (92.28%) isolates were identified as MRSA. A decreased trend of MRSA isolation rate over time was found (P = 0.0063). Majority of MRSA isolates in our center belonged to SCCmec type III (230/239, 96.23%). Antimicrobials susceptibility tests of the MRSA isolates revealed significantly decreased resistance to clindamycin (P = 0.0183), and increased resistance to chloramphenicol (P = 0.0020) and minocycline (P < 0.0001) over time. Trimethoprim/sulfamethoxazole, clindamycin, vancomycin, teicoplanin and linezolid were suggested to be good choice for MRSA infection in our center. Virulence factors profiling showed that most of MRSA isolates in our center carried the virulence factor pattern of cna-clfA-clfB-eno-fib-icaA-icaD-sea-psmα-lukED-hlg-hlgv-hla-hld (214/239, 89.54%). In conclusion, our study suggests that MRSA infection is serious in our burn center, but presented decreased trend over time. Most of MRSA isolates in our center presented the same virulence factor profile. More attention should be attached to nosocomial infection in burn medical center. Antimicrobials susceptibility changing over time was observed. Antimicrobials susceptibility monitoring is necessary and helps to select appropriate drugs against MRSA infections.
['Jiang|Bei|B|', 'Yin|Supeng|S|', 'You|Bo|B|', 'Gong|Yali|Y|', 'Huang|Guangtao|G|', 'Yang|Zichen|Z|', 'Zhang|Yulong|Y|', 'Chen|Yu|Y|', 'Chen|Jing|J|', 'Yuan|Zhiqiang|Z|', 'Hu|Xiaomei|X|', 'Peng|Yizhi|Y|']
D000900:Anti-Bacterial Agents D001426:Bacterial Proteins D002053:Burn Units D002056:Burns D003430:Cross-Sectional Studies D024881:Drug Resistance, Bacterial D005260:Female D006801:Humans D008297:Male D055624:Methicillin-Resistant Staphylococcus aureus D008826:Microbial Sensitivity Tests D037521:Virulence Factors
Burn MRSA Antimicrobials susceptibility SCCmec type III Virulence factor