- Secondary attack rate among the 1286 close contacts was estimated to be 11.2% (95% CI: 9.1-13.8) among household contacts, and 6.6% (95% CI: 5.4-8.1) overall.

University of Michigan - Ann Arbor

Classification of studies on COVID-19 Transmission in Guangdong, China, by City

Bi Q, Wu Y, Mei S et al. Epidemiology and transmission of COVID-19 in 391 cases and 1286 of their close contacts in Shenzhen, China: a retrospective cohort study. The Lancet Infectious Diseases. 2020. doi:10.1016/s1473-3099(20)30287-5

https://www.sciencedirect.com/science/article/pii/S1473309920302875?via%3Dihub

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