In this Sunday, March 8, 2020, photo, residents wearing masks look at their smartphones near an advertisement for 5G smartphones from Chinese tech giant Huawei in Beijing. 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. For most people, the new coronavirus causes only mild or moderate symptoms. For some it can cause more severe illness. (AP Photo/Ng Han Guan)