Causes and sources of Wuhan epidemic in 2020

South China market is a seafood market, in which a boss surnamed Zheng runs the business of importing frozen lobster. According to the logistics information, Mr. Zheng bought a batch of American chilled lobsters on 20 19 1 1, which came from Maine, USA and was airlifted to Wuhan. After receiving this batch of chilled lobsters, Mr. Zheng distributed some of them to three other merchants in the South China market. The employees of these three merchants were the first to be diagnosed. These lobsters are the most suspicious source of infection in the first round of COVID-19.