WASHINGTON, July 27 — The Centres for Disease Control and Prevention (CDC) is set today to announce revised mask guidance for fully vaccinated Americans in the wake of rising Covid-19 cases.

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

The CDC and White House did not immediately comment. The CDC said it plans a 3 p.m. media briefing. — Reuters