, which both began late-stage trials for their leading vaccine candidates last week, and have already vaccinated "several hundred people," according to senior administration officials.
, which both began late-stage trials for their leading vaccine candidates last week, and have already vaccinated "several hundred people," according to senior administration officials.
Because of the pandemic, U.S. health officials and researchers have been accelerating the development of vaccine candidates by investing in multiple stages of research even though doing so could be for naught if the vaccine ends up not being effective or safe. Though scientists expect to have an effective vaccine widely available by next year, there is never a guarantee. While drugmakers are racing to make millions of doses of vaccines, there's a chance the vaccine will require two doses rather than one, potentially further limiting the number of people who can get vaccinated once it becomes available, experts say.
Additionally, scientists say that questions remain about how the human body responds once it's been infected with the virus. The answers, they say, may have important implications for vaccine development, including how quickly it can be deployed to the public.
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