Masked employees in an office. Photo via Pixabay

The Centers for Disease Control and Prevention are expected to announce on Tuesday revised mask guidance for fully vaccinated Americans in the wake of rising COVID-19 cases and the more transmissible Delta variant.

Officials told Reuters the CDC is expected to recommend fully vaccinated Americans wear masks indoors in at least some instances, but the specifics were not yet available.

The CDC and White House declined to comment. The CDC said it plans a COVID-19 media briefing at noon Pacific time.

In May, the CDC advised that fully vaccinated people do not need to wear masks outdoors and can avoid wearing them indoors in most places, guidance the agency said would allow life to begin to return to normal.

The CDC also said in May fully immunized people would not need to physically distance in most places.

CDC Director Rochelle Walensky said in May the new guidance was based on a sharp reduction in cases, expansion of vaccines to younger people, and vaccine efficacy against coronavirus variants.

The CDC in May said it still recommended vaccinated people wear masks on planes and trains, and at airports, transit hubs, mass transit and places like hospitals and doctor’s offices.

Top infectious disease official Anthony Fauci said on Sunday on CNN that health officials were considering whether to revise mask guidance for vaccinated Americans, saying it was “under active consideration.”

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