The U.S. government is “cautiously optimistic” that one or two vaccines, likely from Pfizer Inc or Moderna Inc, will be available by the end of the year and can begin to be distributed to Americans, officials said during a news conference. Azar said he expects all seniors, healthcare workers, and first responders will be able to receive a vaccine as soon as January, with the rest of the American public able to get a vaccine by April.
