The Center for Disease Control and Prevention’s revised guidelines have done away with universal masking at health care facilities, making masking optional if community Covid transmission isn’t high. It’s the latest attempt of public health officials to adapt their guidance to meet the country’s fatigued sensibilities. Some patients will be at risk.

There has been much criticism of the decision by the Centers for Disease Control and Prevention (CDC) to let Covid-infected people who are feeling better to stop quarantining after five days and simply wear a mask. But this sort of pragmatic decision has a long history in public health.

The C.D.C.'s latest policy guidance that people who have been fully vaccinated against the coronavirus virus no longer need to wear face masks indoors gets the science right, but policymaking wrong.