Moderna’s chief medical officer says there is a chance a third shot may be needed, so the company will have to test people to see if the booster will extend protection, KDKA's Amy Wadas reports.
Much-Needed Moderna Vaccine Delivered to Hard-Hit Community
CBS 5 SF KPIX
California was trying to tackle two problems in East Palo Alto Saturday. One was simply to get more vaccine distributed to more..
