On Jun. 13, 2020, officials from the WHO National Health Commission and Beijing Health Commission announced preliminary investigations in Beijing that confirmed 46 laboratory confirmed cases without symptoms of COVID-19 had been identified in Beijing.

The first identified case had symptom onset on 9 June, and was confirmed on 11 June. Several of the initial cases were identified through six fever clinics in Beijing. Preliminary investigations revealed that some of the initial symptomatic cases had a link to the Xinfadi Market in Beijing.