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Species Distribution and Antifungal Susceptibilities of Yeast Clinical Isolates from Three Hospitals in Korea, 2001 to 2007

  • Lee, Mi-Kyung (Department of Laboratory Medicine, Chung-Ang University College of Medicine) ;
  • Yong, Dong-Eun (Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine) ;
  • Kim, Myung-Sook (Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine) ;
  • Kim, Mi-Na (Department of Laboratory Medicine, University of Ulsan College of Medicine and Asan Medical Center) ;
  • Lee, Kyung-Won (Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine)
  • Received : 2010.01.15
  • Accepted : 2010.07.12
  • Published : 2010.08.31

Abstract

Background : We utilized results from the ARTEMIS DISK Global Antifungal Surveillance Program to evaluate the species distribution and fluconazole and voriconazole susceptibilities of yeast isolates from clinical specimens in South Korea from 2001 to 2007. Methods : Data were collected on 5,665 yeast isolates from all body sites at three locations. All investigators tested clinical yeast isolates using the CLSI M44-A disk diffusion method. Test plates were automatically read and results were recorded using the BIOMIC image analysis plate reader system (Giles Scientific, USA). Species, drug, zone diameter, susceptibility category, and quality control results were collected quarterly via e-mail for analysis. Results: Candida albicans was the most common isolate, but a progressive increase in non-C. albicans Candida and noncandidal yeast species has been observed in recent years. The overall percentages of isolates in each category (susceptible, susceptible dose dependent, and resistant) were 98.8%, 0.5%, and 0.7% and 99.2%, 0.2%, and 0.6% for fluconazole and voriconazole, respectively. Candida of 3 species exhibited decreased susceptibility to fluconazole (<90% S) in the order of that seen with the resistant (R) species: C. krusei, C. guilliermondii, and C. glabrata. Emerging resistance to fluconazole or voriconazole was documented among isolates of Cryptococcus neoformans, Trichosporon spp., and Rhodotorula spp. Conclusions : The species distribution and antifungal susceptibilities of yeasts may differ according to specimen type, testing method, hospital, and geographic region. Therefore, further largescaled, long-term surveillance studies are needed to isolate yeasts and to confirm the species distribution and antifungal susceptibilities of yeast isolates from clinical specimens in Korea.

배경 : 본 연구에서는 2001년부터 2007년까지 ARTEMIS DISK Global Antifungal Surveillance Program에 참여하여 얻은 결과를 이용하여, 국내 임상 검체에서 분리된 효모의 균종분포와 fluconazole과 voriconazole에 대한 감수성 양상을 분석하였다. 방법 : 국내 3개 병원의 각종 임상검체에서 분리된 5,665 균주의 효모에서 자료를 수집하였다. 감수성 검사는 CLSI M44-A에 근거하여 디스크확산법으로 시행하였다. 결과는 BIOMIC image analysis plate reader system (Giles Scientific, USA)을 사용하여 판독하였다. 결과 분석을 위하여 균종명, 약제, 억제대 지름, 카테고리에 의한 감수성 결과, 정도관리 결과 등을 전자 메일을 사용하여 전송하였다. 결과 : Candida albicans가 가장 흔히 분리되었으며, 최근 non-C. albicans 칸디다와 칸디다 이외 효모의 증가를 보이고 있다. 효모의 fluconazole과 voriconazole에 대한 감수성 결과는 각각 98.8%와 99.2% (감수성), 0.5%와 0.2% (약용량 의존감수성), 0.7%와 0.6% (내성)였다. Candida krusei, Candida guilliermondii 및 Candida glabrata 3 균종의 칸디다에서 fluconazole 내성이 검출되어 fluconazole에 대한 감수성이 감소한 것으로 조사되었다(<90% 감수성). Fluconazole이나 voriconazole에 내성이 검출된 균종은 Cryptococcus neoformans, Trichosporon spp.와 Rhodotorula spp.였다. 결론 : 효모의 균종 분포와 항진균제 감수성은 검체 종류, 사용하는 검사법, 병원, 지역에 따라 다를 수 있기 때문에, 국내에서 분리되는 효모의 균종 분포와 항진균제 감수성을 평가하기 위한 대규모의 장기간 감시 연구가 필요할 것으로 생각된다.

Keywords

References

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