White House Outbreak Shows Testing Alone Can’t Halt Covid Spread

When President Donald Trump, returning from the hospital suffering from Covid-19 and still infectious, waved to the cameras from the Truman balcony and doffed his protective mask, virologists everywhere gasped. The moment crystallized for them just how badly Trump’s handlers had miscalculated by attempting to protect their boss soley with Covid tests.

Trump, now at the center of a growing cluster of cases the White House, is Exhibit A of a strategy that’s becoming clear was destined to fail. Every day, more of his close contacts and one-time visitors are turning up positive for the novel coronavirus that has sickened more than 7 million Americans ...