June 14, 2021

Community-Level Evidence for SARS-CoV-2 Vaccine Protection of Unvaccinated Individuals

Category: Article Summary

Topic: Vaccines and Immunity

Keywords (Tags): vaccination

• A study of SARS-CoV-2 vaccination in 177 different communities in Israel indicated that for every 20 percentage point increase in the proportion of individuals who were vaccinated in a given population, the positive test fraction for the unvaccinated population decreased approximately two-fold, which the authors suggest shows that vaccination provides indirect protection to unvaccinated individuals. Findings from the study indicated that across communities, the positive test fraction in the unvaccinated cohort decreased in proportion to the rate of vaccination in each community.

Milman et al. (June 2021). Community-Level Evidence for SARS-CoV-2 Vaccine Protection of Unvaccinated Individuals. Nature Medicine. https://doi.org/10.1038/s41591-021-01407-5