BEIJING, CHINA - JUNE 15: Citizens and Chinese epidemic control workers are seen at a site where authorities were performing nucleic acid tests for COVID-19 on citizens who have had contact with the the Xinfadi Wholesale Market or someone who has, at an outdoor sports center June 15, 2020 in Beijing, China. Authorities are trying to contain the outbreak linked to the Xinfadi wholesale food market, Beijing's biggest supplier of produce and meat. Several neighborhoods have been locked down and at least two other food markets were closed, as tens of thousands of people are being urged to get tested for COVID-19 at sites set up around the city. The outbreak has triggered fears of a second wave of infection after 56 straight days with no domestically transmitted cases in the capital. More than 8,000 vendors and staff at Xinfadi have already been tested, according to city officials, who are using contact tracing to reach an estimated 200,000 people who have visited the market since May 30. (Photo by Kevin Frayer/Getty Images)