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Jeong-Sun Yang 1 Article
Asymptomatic Middle East Respiratory Syndrome coronavirus infection using a serologic survey in Korea
Yeong-jun Song, Jeong-Sun Yang, Hee Jung Yoon, Hae-Sung Nam, Soon Young Lee, Hae-Kwan Cheong, Woo-Jung Park, Sung Han Park, Bo Youl Choi, Sung Soon Kim, Moran Ki
Epidemiol Health. 2018;40:e2018014.   Published online April 15, 2018
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AbstractAbstract AbstractSummary PDF
The rates of asymptomatic infection with Middle East Respiratory Syndrome (MERS) coronavirus vary. A serologic study was conducted to determine the asymptomatic MERS infection rate in healthcare workers and non-healthcare workers by exposure status.
Study participants were selected from contacts of MERS patients based on a priority system in 4 regions strongly affected by the 2015 MERS outbreak. A sero-epidemiological survey was performed in 1,610 contacts (average duration from exposure to test, 4.8 months), and the collected sera were tested using an enzyme-linked immunespecific assay (ELISA), immunofluorescence assay (IFA), and plaque reduction neutralization antibody test (PRNT). Among the 1,610 contacts, there were 7 ELISA-positive cases, of which 1 exhibited positive IFA and PRNT results.
The asymptomatic infection rate was 0.060% (95% confidence interval, 0.002 to 0.346). The asymptomatic MERS case was a patient who had been hospitalized with patient zero on the same floor of the hospital at the same time. The case was quarantined at home for 2 weeks after discharge, and had underlying diseases, including hypertension, angina, and degenerative arthritis.
The asymptomatic infection was acquired via healthcare-associated transmission. Thus, it is necessary to extend serologic studies to include inpatient contacts who have no symptoms.
Korean summary
2015년 국내 MERS 유행시에 자가격리를 시행하였던 접촉자 약 15,000명 (의료인과 비의료인 포함) 중에서 주요 유행지역, 노출 강도 등을 고려하여 선별된 3,291명을 대상으로 무증상 감염여부를 확인하기 위한 혈청 역학조사를 수행하였다. 최종 검사에 참여한 1,610명 중에서 7명이 ELISA 양성 반응을 보였고, 그 중 1명이 IFA와 PRNT에서도 양성 반응을 보여 무증상 감염률은 0.060%(95% CI: 0.002-0.346)로 기존 연구에 비하여 낮았다. 최종 양성을 보인 1명은 노출 당시 1번환자와 가까운 병실에 입원하였던 환자였다.
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Epidemiol Health : Epidemiology and Health