최근 5년간 국내 소아청소년에서 분리된 Haemophilus influenzae의 항생제 감수성 분석
Trend of Antibiotic Susceptibility of Haemophilus influenzae Isolated from Children, 2014–2019
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목적: 최근 β-lactam 계 항생제에 대한 내성을 보이는 Haemophilus influenzae가 증가하고 있다. 본 연구는 최근 5년간 서울아산병원 어린이 병원에서 분리된 H. influenzae 균주의 항생제 내성 양상을 분석하고자 한다. 방법: 2014년 3월부터 2019년 4월까지 서울아산병원 어린이병원을 내원한 18세 미만의 소아청소년 환자의 임상 검체에서 분리된 H. influenzae 균주를 대상으로 항생제 내성 양상을 분석하였다. 결과: 최근 5년간 총 69례의 H. influenzae가 분리되었으며 이들 환자의 연령 중앙값은 5.0 (2.8–8.6)세였다. 총 69례 중 3례(4.3%)가 혈액 배양에서 분리되었으며, 66례(95.7%)가 비침습성 균주로서 대부분 호흡기 검체(59례)에서 분리되었다. 항생제 감수성 분포는 ampicillin (AMP) 감수성/amoxicillin-clavulanate (AMC) 감수성 균주 15례(21.7%), AMP 내성/AMC 감수성 21례(30.4%), AMP 내성/AMC 내성 33례(47.8%)였으며, 최근 5년에 걸쳐 AMP 내성/AMC 내성 균주는 지속적으로 증가하는 경향을 보였다 (2014–2015: 42.1% [8/19], 2016–2017: 46.4% [13/28], 2018–2019: 54.5% [12/22], P for trend=0.342). 2014-2015년에 비해 2018-2019년 기간에는 cefuroxime과 ceftriaxone에 대한 내성률은 각각 31.6%에서 77.3% 및 0.0% 에서 59.1% 로 유의하게 증가하였다(P for trend 0.003 및 <0.001). 결론: 최근 국내의 3차 의료기관에 입원한 소아에서 분리되는 H. influenzae 균주는 AMP및 AMC에 대해 모두 내성인 경우가 흔하며, cefuroxime 및 ceftriaxone 에 대한 내성률이 유의하게 증가하였다. 이러한 균주의 내성 기전 분석과 함께 이의 출현과 확산을 최소화하기 위한 노력이 필수적이다.
Abstract
Purpose: We investigated the trend of antibiotic susceptibility of Haemophilus influenzae over 5 consecutive years. Methods: We analyzed the antibiotic susceptibility of H. influenzae isolated from children aged <18 years, who were admitted to the Asan Medical Center Children's Hospital from March 2014 to April 2019. Antibiotic susceptibility of H. influenzae was determined by the disk diffusion test according to the European Committee on Antimicrobial Susceptibility Testing guidelines. Results: Excluding duplicates, 69 isolates were obtained over the past 5 years. The median age of the patients was 5 years (range, 2.8–8.6 years). The antibiotic susceptibility patterns were as follows: ampicillin (AMP)-susceptible/amoxicillin-clavulanate (AMC)-susceptible (AS/ACS; n=15 [21.7%]), AMP-resistant/AMC-susceptible (AR/ACS; n=21 [30.4%]), and AMP-resistant/AMC-resistant (AR/ACR; n=33 [47.8%]). The prevalence of isolates with AR/ACR phenotype tended to increase from 42.1% in 2014–2015 to 54.5% in 2018–2019 (P=0.342). Compared to 2014–2015, the resistance rates to cefuroxime and ceftriaxone in 2018–2019 increased from 31.6% to 77.3% and from 0.0% to 59.1%, respectively (P=0.003 and P<0.001, respectively). Conclusions: Over the last 5 years, H. influenzae isolates with AR/ACR phenotype and ceftriaxone resistance were frequently observed at our institute. The incidence of resistance to cefuroxime and ceftriaxone has increased significantly.
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