Mupirocin resistance in Staphylococcus aureus

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Author:
LIU Mei-na(Department of Clinical Laboratory, The First Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China)
LIU Qing-zhong(Department of Clinical Laboratory, The First Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China)
LU Hong(Department of Clinical Laboratory, The First Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China)
DONG Tong-yu(Department of Clinical Laboratory, The First Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China)
WU Qing(Department of Clinical Laboratory, The First Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China)
ZHU Li-qing(Department of Clinical Laboratory, The First Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China)
ZHOU Tie-li(Department of Clinical Laboratory, The First Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China)
Journal Title:
CHINESE JOURNAL OF CLINICAL INFECTIOUS DISEASES
Issue:
Volume 1, Issue 03, 2008
DOI:
Key Word:
Staphylococcus aureus;Mupirecin;Antibiotic resistance;Resistant gene

Abstract: Objective To investigate mupiroein resistance in Staphylococcus aureus (SAU) and the resistance to commonly used antibiotics in mupirocin-resistant strains. Methods Four hundred and ninety clinically isolated SAU strains froin January 2005 to May 2007 in the First Affiliated Hospital,Wenzhou Medical College were screened by mupirocin(5μg)disc diffusion method.Minimum inhibition concentration(MIC)and the amplification of mupA gene were performed to determine the resistance to mupirocin.Resistance to cefoxitin,gentamycin, levofloxacin, trimethoprim/sulfamethoxazole, rifampin, erythromycin, clindamycin, tetracycline and vancomycin in mupirocin-resistant strains was detected by disc diffusion method, and the amplification of mecA gene was performed to confirm the methieillin resistance among mupiroein-resistant strains.Results Twenty-seven mupirocin-resistant strains were obtained,in which 22(81.5%)were hish-level mupirocin resistant(MuH)and the rest were low-level mupirocin resistant(MuL).Among 27 mupirocin-resistant strains,24 were methicillin-resistant Staphylococcus aureus (MRSA)in which 21 were MuH and 3 were MuL strains.Drug sensitivity tests showed that the resistance to gentamycin,levofloxacin,trimethoprim/sulfamethoxazole,rifampin,erythromycin,elindamycin and tetracycline were hish among MuH and MuL strains,and most of these strains were multi-drug resistant.All strains were susceptible to vaneomycin.Conclusions Most of the clinical emerged mupirocin-resistant SAU strains are MuH and show hish resistance to commonly used antibiotics.Therefore,detection and drug sensitivity test of mupirocin-resistant strains should be strengthened in clinic practice in order to prevent it from dissemination.

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