People at Grand Central Terminal in New York City wear masks on July 27, 2021. (Photo: AFP-Yonhap)
The United States has announced tougher rules to combat a sharp rise in coronavirus cases caused by the more infectious Delta variant.
The Centers for Disease Control and Prevention advises even vaccinated people to wear face masks in public indoor spaces.
It reverses advice issued in May.
With more details, the BBC's Peter Bowes reports.
The CDC says about two thirds of counties have high transmission rates that warrant the wearing of masks, with the Delta variant behind many of the surges.
Some states such as Florida and Missouri have seen rapidly rising infection rates.
The CDC's guidance is a reversal of its position two months ago and poses a dilemma for many local and state authorities, with some highly reluctant to accept tougher measures.
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