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What is a cross-regional epidemic investigation?

Significance of cross-regional work inspection. Cross-regional survey in COVID-19 refers to cross-regional work survey. In other words, there is a case of COVID-19 epidemic that needs cross-regional investigation. For example, a COVID-19 epidemic person in Zhejiang Province has arrived in Fujian Province, so Zhejiang Province sent a cross-regional investigation letter to Fujian Province, and Fujian Province immediately tracked the epidemic person according to the relevant information provided by Zhejiang Province and took emergency management measures.