China News Service, Dalian, January 3 (Reporter Yang Yi) Zhao Lian, deputy director of the Dalian Municipal Health Commission, said at a press conference on epidemic prevention and control held by the local government on the 3rd that the national, provincial, and municipal CDCs are The whole genome sequence analysis of confirmed cases of the epidemic, asymptomatic infections and related environmental and cargo samples has been carried out. The virus genome is different from the previous whole genome sequence comparison of the new coronavirus in Dalian, which excludes the continued spread of the local new coronavirus; The virus of this epidemic conforms to the characteristics of L2 branch L2.1 of the European family of the L genotype. The results support that the source of transmission is from abroad. The virus genome in the epidemic genome and the 4 cold chain products are highly homologous to the virus strains circulating in Russia in November. Strong genetic association.
Moreover, the whole genome sequence is not genetically related to the imported cases that have been reported in my country and the domestic cases, and it is not the continuous spread of the domestic epidemic in recent months; it is related to the international GISAID database, the local epidemic situation in various domestic provinces and cities, and the import of new coronaviruses abroad Compared with the gene bank, no highly homologous sequence is seen, which is a new input.
Zhao Lian said that it was preliminarily determined that the local epidemic in Dalian came from imported cold chain products that had contaminated the new crown virus.
This Dalian case is highly homologous and is a local clustered epidemic caused by the first case.
Based on on-site epidemiological investigation and molecular epidemiological analysis, it was preliminarily determined that the source of the infection was caused by five dock workers.
Preliminary analysis based on the existing evidence shows that the vast majority of the cases in this epidemic were caused by Dalian Port dock workers who were infected by carrying bulk goods positive for the new crown virus on a Russian freighter. Later, after the activities of Case 5, they were in Jinzuo Commercial Building. Infects merchants and customers inside, and spreads within the home through infected merchants and customers.
At present, 75 cases and infected persons have confirmed the source of infection, and the source of infection of 3 people in a new family of Shi is under investigation.
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