Household secondary attack rate of COVID-19 and associated determinants in Guangzhou, China: a retrospective cohort study

Using contact tracing data from patients with COVID-19, researchers implemented a statistical transmission model to estimate secondary attack rate. They reported rate of 12.4% for household contacts and older people (aged≥60 years) were most susceptible to household transmission.

SPS commentary:

According to a commentary, this study demonstrates the value of carefully collected contact tracing data to understand risk factors for transmission and susceptibility. It notes the findings also confirm the relative importance of presymptomatic transmission, and the association between older age and susceptibility, key insights which should inform the design of intervention strategies.


The Lancet Infectious Diseases

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