Higher levels of vaccination against COVID-19 were associated with lower rates of infection with SARS-CoV-2 among a group of unvaccinated people of 16 years of age and under, reports a study in Nature Medicine. The findings, based on an analysis of vaccination records and test results from 177 geographically distinct communities in Israel from 6 December 2020 to 9 March 2021, demonstrate that vaccination against COVID-19 helps to protect those who have and have not been vaccinated.