National Health & Safety Should I mix and match my COVID booster with my initial vaccine? A doctor weighs in 4:49pm November 19, 2021 Health Medical Treatments 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 World News A U.S. doctor in Gaza wants President Biden to know 'we are not safe' Arts Life Kit: tips on lending money by Andrew Limbong 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate