CDC releases study showing that mRNA vaccines perform almost the same in the real world as they did in the lab. Further indications are they prevent disease and its transmission.

Medical Mythbusting Commentary for March 31 , 2021

Moderna And Pfizer Vaccines Prevent Infection As Well As Disease: Key Questions Remain

Interim Estimates of Vaccine Effectiveness of BNT162b2 and mRNA-1273 COVID-19 Vaccines in Preventing SARS-CoV-2 Infection Among Health Care Personnel, First Responders, and Other Essential and Frontline Workers — Eight U.S. Locations, December 2020–March 2021