Vaccinated Americans may need to wear masks not just to protect themselves, but everyone in their orbit. If vaccinated people are transmitting the Delta variant, they may be contributing to the increases — although probably to a far lesser degree than the unvaccinated. has not yet published its data, frustrating experts who want to understand the basis for the change of heart on masks. Four scientists familiar with the research said it was compelling and justified the C.D.C.’s advice that the vaccinated wear masks again in public indoor spaces. Nearly three-quarters of those people were fully vaccinated.

Source: New York Times July 29, 2021 21:31 UTC