Some health experts have pushed back on federal guidance that vaccinated Americans can go without masks due to the surge in delta variant cases. Pediatricians have called for mask mandates in schools. WATCH THE FULL EPISODE OF 'WORLD NEWS TONIGHT': https://bit.ly/3uHCDO5 WATCH OTHER FULL EPISODES OF WORLD NEWS TONIGHT: http://abc.go.com/shows/world-news-tonight WATCH WORLD NEWS TONIGHT ON HULU: https://bit.ly/3iQLwPp #DeltaVariant #COVID19 #Surge #Coronavirus