SARS-CoV-2 seroprevalence and transmission risk factors among high-risk close contacts: a retrospective cohort study

Study (n=7,770, Singapore) reports targeted community measures should include physical distancing and minimising verbal interactions; and testing of all household contacts, including asymptomatic individuals, is warranted.

SPS commentary:

Results of the study showed that among 7518 (96.8%) of the 7,770 close contacts with complete data, the secondary clinical attack rate was 5.9% (95% CI 4.9–7.1) for 1779 household contacts, 1.3% (0.9–1.9) for 2231 work contacts, and 1.3% (1.0–1.7) for 3508 social contacts.

The Lancet Infectious Diseases