As the coronavirus evolves, so does the science. The Delta variant is creating uncertainty about how much vaccines prevent transmission, but the overwhelming evidence shows they are highly protective against severe illness. Please get vaccinated if you aren’t already.
That should have been the Centers for Disease Control and Prevention’s straightforward message to Americans this week, along with a candid analysis of its evidence.
Instead, the CDC on Tuesday issued murky new guidance, without backup evidence, recommending that vaccinated people resume wearing masks indoors in some cases because unpublished studies suggest they could transmit the virus. But on …
