Via NBC:

There are also critical questions that have yet to be answered in clinical studies about whether the vaccines actually prevent the transmission of the virus.

“What we know is if you get that vaccine, you are more likely not going to get severely ill from the virus,” explained Dr. Pia MacDonald an epidemiologist and senior director of RTI International’s applied public health research. “We don’t yet know what that means about your ability to transmit the virus to others even if you are vaccinated.”

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