Latest coronavirus development in the U.S.

First Congress member tests positive: U.S. Representative Mario Diaz-Balart, a Florida Democrat, said on Wednesday he has tested positive for the coronavirus after developing symptoms.

Infection number over 7,700: According to Johns Hopkins University data, a total of 7,769 infections were detected in the U.S. with 118 deaths as of Wednesday night. New York State is hardest hit, accounting for nearly one-third of the nationwide confirmed cases.

NYSE goes electronic: The New York Stock Exchange will close its trading floor and move to fully electronic trading on Monday. Two people at the NYSE have tested positive for the coronavirus.

Defense Production Act to be invoked: U.S. President Donald Trump Wednesday announced that he will invoke the 1950 wartime law which will expand the country's response to the outbreak including allowing the production expansion of masks and protective gears.

Relief package passed by Senate: A coronavirus relief package has passed by the U.S. Congress, sending it to Trump. It includes provisions for free testing for the virus and paid emergency leave.

U.S. stock halted for the fourth time in a month: The U.S. stock trading is halted for the fourth time this month as S&P 500 dropped by seven percent on Wednesday. Dow fell by 6.3 percent, erasing nearly all the gains since Trump's inauguration.

U.S.-Canada border closure: President Donald Trump said on Twitter that the U.S. will temporarily close its northern border with Canada to non-essential traffic, adding trade won't be affected.