COVID-19 vaccines reduce severity, length, viral load for those who still get infected.

COVID-19 vaccine reduces severity, length, viral load for those who still get infected – University of Arizona Health Sciences

Original study: Prevention and Attenuation of Covid-19 with the BNT162b2 and mRNA-1273 Vaccines – New England Journal of Medicine

Commentary on Twitter

The @CDCgov trial to rigorously assess mRNA vaccination suppression of covid infections as assessed with frequent NP swabs in nearly 4,000 participants
91% efficacy of blocking transmission of infection (2 doses); 40% reduction of viral load https://t.co/tI6LECbw42 pic.twitter.com/y85Vd9ih5A

— Eric Topol (@EricTopol) June 30, 2021