We acted with the data that we had at the time, the data that we had at the time, the country mostly had alpha — alpha among breakthrough vaccinated infections was not being transmitted to other people. And the new data that we have is that Delta is able, in those rare breakthrough infections, to be transmitted to others. We know that our young children, 11 and younger, cannot be vaccinated. We know that our vaccinated individuals, in the rare case that there are a breakthrough, have the potential to pass the virus on to unvaccinated individuals. We know that our 12 to 17-year-olds, right now, have only about 30 percent coverage in fully, in being fully vaccinated.

Source: New York Times July 27, 2021 13:55 UTC