The data are preliminary so far, but there are concerns that some new COVID strains are more infectious, more deadly, and possibly even more resistant to the vaccines -- and experts stress mass vaccination is crucial to slowing the spread. Dr. Atul Gawande, a staff writer for the New Yorker and a Massachusetts's surgeon leading an inoculation campaign, joins William Brangham to discuss.

Stream your PBS favorites with the PBS app: https://to.pbs.org/2Jb8twG
Find more from PBS NewsHour at https://www.pbs.org/newshour
Subscribe to our YouTube channel: https://bit.ly/2HfsCD6

Follow us:
Facebook: http://www.pbs.org/newshour
Twitter: http://www.twitter.com/newshour
Instagram: http://www.instagram.com/newshour

Subscribe:
PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts
Newsletters: https://www.pbs.org/newshour/subscribe