Mass. doc.: 'All the data we have show vaccines are very effective'

Video Credit: WCVB

Published on July 27, 2021 - Duration: 03:31s

Mass. doc.: 'All the data we have show vaccines are very effective'

Tufts Dr. Helen Boucher is asked if there is any evidence that vaccinated individuals with COVID-19 are also spreading the virus to others.

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