The vaccine does prevent the spread. The two about to be released are over 90% effective.
“If vaccinated individuals are capable of transmitting infection,” Corey writes, “then anybody who is not vaccinated fares no differently before than after the introduction of a COVID-19 vaccine. With vaccine hesitancy resulting in fewer people agreeing to be vaccinated, we do not yet know whether and when we will be able to markedly reduce the public health implications of COVID-19 and reduce its circulation in the workplace, in close communities and stop super-spreading events.”