혈액배양에서 분리된 Fluoroquinolone계 약제 내성 황색포도알균의 SCCmec 아형에 따른 gyrA와 gyrB 유전자에서의 DNA 돌연변이 양상

하였다. 대전광역시 소재 1개 종합병원에서 혈액배양 검체에서 분리된 QRSA 균주를 대상으로 mecA와 SCCmec 유전자형 분석에 따른, gyrA, gyrB 유전자의 돌연변이를 조사하였다. Ciprofloxacin 내성균주는 SCCmec typing에서 II형이 44개로 73%, IVa형이 5개로 8%, III와 V형이 1개로 2%, non typeable 균주가 11개로 18%, levofloxacin, moxifloxacin은 II형이 44개로 73%, IVa형이 5개로 8%, III와 V형이 1개로 2%, non typeable 균주가 10개로 17%의 결과를 보였다. gyrA와 gyrB 영역 모두에서 58개로 96.7%, levofloxacin은 56개로 93.3%, moxifloxacin에는 57개로 95%를 나타냈다. QRSA 균주에 대한 gyrA와 gyrB의 돌연변이는 각각 6개씩 12개의 돌연변이가 확인되었다. 연구 대상 QRSA의 FQ 항균제의 내성률은 약 98%를 나타냈고, QRSA 균주에 대한 gyrA와 gyrB의 돌연변이는 각각 6개씩 12개의 돌연변이가 확인되었다. The emergence and spread of Staphylococcus aureus, which is resistant to quinolone antibacterial agents, has made it difficult to treat infectious diseases. Accordingly, this study examined the molecular epidemiological characteristics of quinolone-resistant S. aureus (QRSA) to obtain helpful data for treatment. Mutations in mecA and SCCmec typing, gyrA, and gyrB genes were investigated for QRSA strains isolated from the blood culture specimens at a general hospital in Daejeon Metropolitan City. The ciprofloxacin-resistant strains in SCCmec typing were II (44 strains, 73%), IVa (five strains, 8%), III, and V (one strain, 2%); the non-typeable strains (11 strains, 18%), and levofloxacin (LVX) and moxifloxacin (MXF) strains were II (44 strains, 73%), IVa (five strains, 8%), III, and V (one strain, 2%); the non-typeable strains were 10 (17%). In both gyrA and gyrB regions, there were 58 mutations, or 96.7%. In LVX, there were 56 mutations or 93.3%, and in MXF, there were 57 mutations or 95%. Twelve mutations, six mutations each in gyrA and gyrB, were identified for the QRSA strain. The resistance rate for the quinolone antibiotics of QRSA studied was approximately 98%, and 12 mutations, six each in gyrA and gyrB, were identified in the QRSA strain. Therefore, the rational use of antibiotics needs to be improved.