New COVID-19 variant discovered in California as U.S. death toll nears 400,000

Efforts to administer the coronavirus vaccine are ramping up in the U.S., but the nation is nearing the horrifying milestone of 400,000 deaths from COVID-19. Meanwhile, researchers have found a new variant of the disease in hard-hit California. John Moore, a professor of microbiology and immunology at Weill Cornell Medical College, joins CBSN to discuss.