evidence: How to protect unvaccinated children from COVID: vaccinate their parents [...] Parents vaccinated against COVID-19 shield their unvaccinated children from infection with the Alpha and Delta variants of SARS-CoV-2, according to a study of more than 150,000 households in Israel1. [...] Between January and March 2021, when Alpha was dominant, children under the age of 16 were around 72% less likely to get infected if they lived with two fully vaccinated parents than if they lived with two unvaccinated parents. Between July and September 2021, when Delta was dominant, children younger than 12 were 58% less likely to become infected if both parents had received a booster jab than if they had received only two vaccine doses.