A day later, two more infected people surfaced. The patients were coworkers at a meat research center and also had no recent contact with anyone who had traveled overseas. However, one of them traveled to the eastern Chinese city of Qingdao for a five-day business trip before falling ill.
Fearing a second wave of infections, Chinese officials have come down hard, closing off communities where the new infected lived. Residents there are also subject to temperature checks, and authorities are working to disinfect public locations and implement a track and trace program.
The crackdown comes after Beijing scapped a mandatory 14-day quarantine for travelers arriving from other parts of China. The city also allowed most businesses to reopen.