(Chinatopix via AP) In this Jan. 27, 2020 photo, community health workers check the temperature of a person who recently returned from Hubei Province, center of a virus outbreak, in Hangzhou in eastern China's Zhejiang Province. As China institutes the largest quarantine in human history, locking down more than 50 million people in the center of the country, those who have recently been to Wuhan are being tracked, monitored, turned away from hotels and shoved into isolation at their homes and in makeshift quarantine facilities.