Sen. Carl Levin (D-MI) questions a witness during a hearing of the Permanent Subcommittee on Investigations of the Senate Homeland Security and Governmental Affairs Committee November 20, 2014 in Washington, DC (Photo by Win McNamee/Getty Images)
Researchers at the UW Medicine Retrovirology Research Lab at Harborview Medical Center work on samples from the Novavax phase 3 Covid-19 clinical vaccine trial on February 12, 2021 in Seattle, Washington