作者
Oon Tek Ng, Kalisvar Marimuthu, Vanessa Koh, Junxiong Pang, Kyaw Zaw Linn, Jie Sun, Liang De Wang, Wan Ni Chia, Charles Tiu, Monica Chan, Li Min Ling, Shawn Vasoo, Mohammad Yazid Abdad, Po Ying Chia, Tau Hong Lee, Ray Junhao Lin, Sapna P Sadarangani, I Mark, Cheng Chen, Zubaidah Said, Lalitha Kurupatham, Rachael Pung, Lin-Fa Wang, Alex R Cook, Yee-Sin Leo, Vernon JM Lee
发表日期
2021/3/1
期刊
The Lancet infectious diseases
卷号
21
期号
3
页码范围
333-343
出版商
Elsevier
简介
Background
The proportion of asymptomatic carriers and transmission risk factors of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) among household and non-household contacts remains unclear. In Singapore, extensive contact tracing by the Ministry of Health for every diagnosed COVID-19 case, and legally enforced quarantine and intensive health surveillance of close contacts provided a rare opportunity to determine asymptomatic attack rates and SARS-CoV-2 transmission risk factors among community close contacts of patients with COVID-19.
Methods
This retrospective cohort study involved all close contacts of confirmed COVID-19 cases in Singapore, identified between Jan 23 and April 3, 2020. Household contacts were defined as individuals who shared a residence with the index COVID-19 case. Non-household close contacts were defined as those who had contact for at least 30 min …
学术搜索中的文章
OT Ng, K Marimuthu, V Koh, J Pang, KZ Linn, J Sun… - The Lancet infectious diseases, 2021
