The head of the World Health Organization says the coronavirus outbreak is accelerating but insists "we can change the trajectory of this pandemic." More than 1.5 billion people — one-fifth of the world's population — were urged or ordered to stay home Monday to try to blunt the spread of coronavirus. The death toll from the pandemic has surpassed 16,000 people worldwide, and the virus has sickened more than 370,000.

Partisan divisions stalled efforts to pass a colossal aid package in Congress, and stocks fell again on Wall Street even after the Federal Reserve said it will lend to small and l...