The 2019–20 coronavirus pandemic was first manifested by a cluster of mysterious pneumonia in Wuhan, the capital of Hubei Province, China. A Wuhan hospital notified the local center for disease control and prevention (CDC) and health commissions on December 27, 2019. On December 31, Wuhan CDC admitted that there was a cluster of unknown pneumonia cases related to Huanan Seafood Wholesale Market after the unverified documents appeared on the Internet.