What does cross-regional coordinated investigation of COVID-19 mean?

The meaning of cross-regional work coordination investigation. Cross-regional co-investigation of COVID-19 means co-investigating work across regions. That is to say, there is a case of COVID-19 that requires cross-regional investigation. For example, there is a person infected with COVID-19 in Zhejiang Province who has arrived in Fujian Province. Therefore, Zhejiang Province sent a letter of cross-regional investigation to Fujian Province. Based on the relevant information provided by Zhejiang Province, Fujian Province immediately conducted investigation on the person affected by the epidemic. Follow up and take emergency management measures.