Reporter Yang Jinwei learned from the 71st press conference on epidemic prevention and control held in Dalian, Liaoning Province on January 11 that the source of the epidemic in Dalian has been initially identified, the transmission chain has been basically grasped, and the relationship between the cases is clear. The virus genome of this epidemic is compared with the previous new coronavirus genome sequence in Dalian. They are of different origins, which excludes the continued spread of the local new coronavirus, and there is no genetic association with the previously reported imported cases and domestic domestic cases in my country. A new entry. It is preliminarily determined that the Dalian epidemic originated from imported cold chain products contaminated by the new crown virus.

　　According to a preliminary analysis based on the currently available evidence, most of the cases in the epidemic were dock workers at Dalian Port. These workers were infected by carrying bulk goods that were positive for the new crown virus on a Russian freighter. After that, dockers moved in the Jinzuo commercial building, causing infections among merchants and customers, and subsequent spread. Currently, 83 cases and asymptomatic infections have all been identified as the source of infection.

　　An epidemiological investigation revealed that five Dalian (Haohan) labor service company dockers moved the frozen bulk cargo at the bottom of the Russian cargo ship from December 2 to 9, 2020. The infection was caused by the outer packaging of the cargo contaminated by the new crown virus. Among them, Case 1 to Case 4 infected the two heads of households and two couples of restaurant owners through helping people to move and dinner on December 12, 2020; Li, the dispatcher of the terminal labor service company, due to the fact that in December 2020 From the 11th to the 15th, he went to Dalian (Haohan) Labor Service Company many times and had contact with the above-mentioned dockers and was subsequently infected. Case 5 was active in the Jinzuo commercial building on December 11, 2020, which caused the infection of two shoppers who were active in the Jinzuo commercial building from the 11th to the 12th, which in turn triggered other merchant customers in the Jinzuo commercial building and subsequent close contacts Infection.