BEIJING—Beibei sleeps beside thousands of strangers in rows of cots in a high-ceilinged exhibition center. The lights stay on all night, and the 30-year-old real estate saleswoman has yet to find a hot shower.
Beibei and her husband were ordered into the massive National Exhibition and Convention Center in Shanghai last Tuesday after spending 10 days isolated at home following a positive test. Their 2-year-old daughter, who was negative, went to her grandfather, while her nanny also went into quarantine.





