Just about every factory in the great coastal manufacturing hubs of Guangdong Province and Shenzhen, the Shanghai -- Suzhou -- Nanjing coridor, or around Chongqing in Sichuan Province has some workers who went home to Wuhan or another contagion area for the holiday. This year a lot of people won't be coming back on time and many companies have already announced that they are delaying reopening, and some cities or provinces like Shanghai and Guangdong have told companies operating there that they may not restart before February 9. When they do come back, managers will have to worry about whether any of their workers have potentially been exposed to the virus and will need to be quarantined for two weeks.