More than 91 million live in US counties with high Covid-19 infections. It's time to reset and put masks back on, experts say - CNN

More than 91 million live in US counties with high Covid-19 infections. It's time to reset and put masks back on, experts say - CNN: With the highly contagious Delta variant spreading, particularly among unvaccinated Americans, it may be time for much of the country to put masks back on, experts said.