The project, announced by the C.D.C., will help trace patterns of transmission, investigate outbreaks and map how the virus is evolving, which can impact a cure.
Despite President Trump’s prodding, most districts have no plans to end online lessons soon. Reopening, when it does come, will bring significant changes, educators say.
The governor accused various world and federal health groups, as well as the news media, of not sufficiently warning the world of the coronavirus outbreak.
The vice president, who leads the White House’s coronavirus task force, said that masks were meant to prevent the spread of the virus and that he was tested regularly and does not have it.