You leave out a crucial point about the changed recommendation regarding masks. It followed the understanding that Covid spreads via aerosol transmission, which was not well understood when the CDC and Fauci were saying we don't need masks. That was more of a driver than the understanding, also relevant, that there were asymptomatic carriers.
You leave out a crucial point about the changed recommendation regarding masks. It followed the understanding that Covid spreads via aerosol transmission, which was not well understood when the CDC and Fauci were saying we don't need masks. That was more of a driver than the understanding, also relevant, that there were asymptomatic carriers.