Dr. Deborah Birx said Saturday that Americans should especially focus on social distancing guidelines in the next two weeks to prevent the spread of the coronavirus. “This is the moment to not be going to the grocery store, not going to the pharmacy, but doing everything you can to keep your family and your friends safe,” she said. Birx noted that Pennsylvania, Colorado, and the Washington, DC, metro area were starting to have an increasing number of cases. “We’re hoping and believing that if people mitigate strongly, the work that they did over the last two weeks will blunt that...