People who let down their guard and got too close to others over Labor Day weekend should get tested for Covid-19, White House coronavirus task coordinator Dr. Deborah Birx said. Much of the coronavirus spread by people who don't have symptoms is happening between and within families and in settings such as neighborhood parties, Birx said Thursday at a media briefing at the University of South Carolina. People who socialized closely with others, especially without a mask, should get tested, Birx said.