계절 인플루엔자 진단에서 신속항원검사의 유용성
The Efficacy of Rapid Antigen Tests for Detection of Seasonal Influenza Virus
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목적: 본 연구에서는 인플루엔자 신속항원검사의 유용성을 확인해보고, 결과의 정확도에 영향을 주는인자를 알아보고자 한다. 방법: 2011년 6월 1일부터 2016년 5월 31일까지 5년간 한림대학교 성심병원의 소아청소년과 외래와응급실을 통해 내원한 인플루엔자 의사환자를 대상으로 하였다. 이들 중 입원하여 PCR검사를 같이 진행한 798검체의 검사 결과를 비교하였다. 결과: PCR검사를 표준으로 신속항원검사의 양성 일치율은 A형 인플루엔자에서 75.7%, B형 인플루엔자에서 60.0%였다. 발열 시작일로부터 4일 이내에 내원하여 검사를 진행한 경우 양성 일치율은 A형인플루엔자 77.6%, B형 인플루엔자 73.2%였으나, 5일 이상 경과 후 검사를 진행한 경우 양성 일치율은 A형 인플루엔자 66.7%, B형 인플루엔자 21.4%였다. 결론: 신속항원검사의 민감도는 상대적으로 낮으므로, 인플루엔자 진단에 적용하기 위해서 증상 발현후 5일 이내 빠르게 채취한 검체에서 상대적으로 높은 민감도 해석이 가능하다.
Abstract
Purpose: This study aimed to examine the accuracy of rapid influenza diagnostic tests (RIDT) in children with an influenza-like illness and to evaluate factors associated with greater accuracy. Methods: Pediatric patients, who visited Hallym University Sacred Heart Hospital with an influenza-like illness between June 2011 and May 2016, were enrolled in this study. We tested 798 samples using a real-time polymerase chain reaction (PCR) for respiratory viruses and compared the results with rapid influenza tests. Results: In comparison with the results of the multiplex PCR, the positive agreement rates of RIDT for influenza A and B virus were 75.7% and 60.0%, respectively. The performance of RIDT varied according to days after fever onset. The positive agreement rates of RIDT for influenza A and B tests, performed within 4 days of fever onset, were 77.6% and 73.2%, but the rates for tests performed more than 5 days after fever onset were 66.7% and 21.4%, respectively. Conclusions: The RIDT is a quick and simple aid to diagnosis, but is less sensitive than the labeled sensitivity. Moreover, test performance varied according to days after fever onset. Test specimens for RIDT should be collected as soon as possible after the onset of symptoms (less than 4 days).
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