Support WBURFacing Many Unknowns, States Rush To Plan Distribution Of COVID-19 VaccinesPlay06:03Download AudioSelena Simmons-DuffinPien HuangOctober 16, 2020 ShareWhile coronavirus vaccine trials are ongoing and a U.S. vaccine has yet to be approved, state health officials are planning ahead for how to eventually immunize a large swath of the population. (AFP via Getty Images)
