The nation’s largest union of registered nurses condemned the Centers for Disease Control and Prevention on Saturday for lifting mask recommendations for vaccinated people and called on the agency to “do the right thing” and revise its guidance.
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“This is a huge blow to our efforts at confronting this virus and the pandemic,” said Ms. Castillo, whose union represents 170,000 nurses nationwide.
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The union also criticized the C.D.C. for other actions, including its decision to stop monitoring breakthrough infections among vaccinated individuals and to investigate such cases only if they result in a hospitalization or death.
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The union also called on the agency, which recently recognized that the virus could be transmitted through aerosolized particles, to update its guidance about ventilation and respiratory protection accordingly.

The union noted that more than 35,000 new cases of coronavirus were being reported each day and that more than 600 people were dying each day. “Now is not the time to relax protective measures, and we are outraged that the C.D.C. has done just that while we are still in the midst of the deadliest pandemic in a century,” Ms. Castillo said.

The Centers for Disease Control and Prevention on Saturday clarified coronavirus advice for U.S. schools, recommending the continued, universal use of masks and physical distancing, after the agency’s sudden announcement that vaccinated Americans could forego masks indoors.