National Health & Safety The masking period of new COVID isolation guidance is where it may fail, experts say 5:07pm December 28, 2021 by Allison Aubrey Health National Share URL copied to clipboard! Play Pause There was an error loading the media player. Copyright 2021 NPR. To see more, visit https://www.npr.org. 300x250 Ad More All Things Considered Arts Director Lee Isaac Chung shares the inspirations behind 'Twisters' Angry Houston residents still want answers after Hurricane Beryl power failure by Stella Chavez 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate