How is it that confirmed patients in Beijing are infected in public toilets without going to epidemic areas?

On June 25 and June 20, two of the confirmed cases were stall owners of the food city on the second floor of Tiankelong Supermarket. They are a couple and have no new contact history. The personnel of Beijing Haidian Sixth Dispatch launched an emergency investigation and finally locked the address of No.70 Yongding Road. It has appeared in the activity place where confirmed cases have been reported four times. The epidemic situation in Tiankelong supermarket is caused by the third-hand infection of the epidemic situation in the new place.

From 0: 00 to 24: 00 on June 24, Beijing newly reported local confirmed cases 13, and there were no new suspected cases and asymptomatic infected people. Since the cluster epidemic occurred in June 1 1 Xinfadi wholesale market, Beijing has reported a total of 269 locally confirmed cases and 269 hospitalized cases. 22 cases of asymptomatic infection are still under observation.

Extended data:

Four main sources of asymptomatic infection:

One is a close contact of COVID-19's case, and some such people were found during medical observation.

Second, in the cluster epidemic investigation, asymptomatic infected people may be found in the process of carrying out some active testing.

Thirdly, in the process of tracing the source of infection in COVID-19, the asymptomatic infected people may be found by actively detecting the exposed population.

Fourthly, people with COVID-19 cases, travel history and living history in areas with persistent transmission may be found asymptomatic.

China Com- the couple were confirmed not to go to the epidemic area and were infected in the public toilet. What happened? Beijing confirmed that the couple did not go to a new place for third-hand infection.