U.S. seeks to educate skeptics, keep up guard with vaccinations under way
While most vaccines take years to develop, the Pfizer vaccine arrived less than a year after the illness was traced to a market in Wuhan, China, in December of last year.
While most vaccines take years to develop, the Pfizer vaccine arrived less than a year after the illness was traced to a market in Wuhan, China, in December of last year.