Contact tracing period and epidemiological characteristics of an outbreak of the SARS-CoV-2 Delta variant in Guangzhou

Xiaowei Ma,Keyi Wu,Yongguang Li,Shunming Li,Lan Cao,Huaping Xie,Jiazhen Zheng,Rui Zhou,Zelin Yuan,Zhiwei Huang,Jun Yuan,Xianbo Wu

International Journal of Infectious Diseases（2022）

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摘要

•Time for tracing close contacts may need expanding to 4 days before symptom onset•Low Ct values were associated with a higher risk of SARS-CoV-2 transmission•Presymptomatic transmission was common in the epidemic of Delta variant

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关键词

COVID-19,Delta variant,contact tracing,epidemiological characteristics

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