As concerns grow over coronavirus variants emerging in Brazil, the United Kingdom and South Africa, NBC News’ Richard Engel visits a lab near Cambridge leading the world in hunting for mutations.Jan. 15, 2021
UP NEXT
Odometer fraud rises as record number of Americans seek used cars
02:37
FAA asks major airlines to slash flights at busy airports due to staffing shortage
01:52
Pope Francis leaves hospital after treatment for bronchitis
01:28
Supporters gather outside of Trump’s Florida golf course ahead of arraignment next week
02:07
Roof collapses at historic Illinois theater, killing 1 and injuring dozens
02:01
Arkansas town devastated after tornadoes battered South and Midwest