People who have received two vaccine doses against COVID-19 have a lower, but still appreciable, risk of becoming infected with the delta variant compared with unvaccinated people. Vaccinated people clear the infection more quickly, but the peak viral load among vaccinated people is similar to that seen in unvaccinated people, which may explain why they can still readily pass on the virus in household settings, according to a study published in The Lancet Infectious Diseases.