The Chinese city of Wuhan, the original epicenter of the new coronavirus, reported no new homegrown infections on Thursday, in what was a sign of hope for the world and a lesson in the strict measures needed to halt its spread. The two milestones were a dramatic illustration of how much the global outbreak has pivoted toward Europe and the United States. Factories in China, struggling to reopen after the coronavirus shut down the economy, face a new threat from U.S. anti-disease controls that might disrupt the flow of microchips and other components they need.
