Find out! The source of the current outbreak in Dalian was initially determined

On the afternoon of January 3, 2021, the press office of dalian municipal government held the 63rd press conference on the prevention and control of the outbreak of new crown pneumonia, inviting Zhao Lian, deputy director of the Dalian Municipal Health and Health Commission, to introduce the latest situation of the prevention and control of the epidemic in Dalian.
, according to Zhao Lian, on December 15, 2020, Dalian reported four cases of asymptomatic infection with neo-crown pneumonia, and relevant departments quickly carried out investigation of the source of infection.
epidemiological investigation, nucleic acid testing, serum antibody testing and genome-wide sequencing analysis of personnel, cargo and environmental specimens were carried out, initially targeting the source of the outbreak and basically mastering the transmission chain.
reported cases as of 24 hours on January 2, 2021, Dalian City reported a total of 78 cases of new coronary pneumonia virus infection, of which 48 were locally confirmed cases and 30 were local asymptomatic infections.
clinical subtypes are: 1 case of heavy, 45 cases of ordinary type, 2 cases of light, 30 cases of asymptomatic infection, no serious case of danger.
78 cases of infected persons, 75 cases (96%) of infected persons work or live concentrated in The New District of Kimpu, of which five key controlled streets (light, friendship, advanced, front of station, support) reported a total of 66 cases of infected persons, accounting for 85% of the total number of infected persons.
29 (37 per cent) of those infected, 49 (63 per cent) were women, with a minimum age of three months, a maximum age of 88 and a median age of 46.
infection source analysis country and provincial and municipal CDC confirmed cases of the outbreak, asymptomatic infected people and related environment, cargo sample virus, carried out genome-wide sequencing analysis, the virus genome and the previous dalian city of the new coronavirus whole genome sequence compared to different sources, excluding the local new coronavirus The virus in this outbreak conforms to the characteristics of L2 branch L2.1 of the L genotype European family, and the results support the transmission source from abroad, the virus genome in the outbreak genome and 4 cold chain products, as well as the strains that were prevalent in Russia in November, are highly ogeneous and have strong genetic correlation.
And the whole genome sequence and China's previously reported imported cases and domestic cases do not have a genetic correlation, not the continuous spread of domestic outbreaks in recent months;
preliminary determination that the local outbreak in Dalian came from imported cold chain products that contaminated the new crown virus.
the Dalian case is highly yethon, is a first case caused by the local aggregation outbreak.
on-site epidemiological investigation and molecular epidemiological analysis, the initial source of infection in this outbreak was determined to be caused by 5 dockworkers (cases 1-5).
Based on the existing evidence for preliminary analysis, the vast majority of cases in this outbreak are Dalian port dock workers because of the transport of Russian cargo ships on the new coronavirus-positive bulk goods caused by infection, and later by the activities of case 5, in the Jinsa commercial building caused by merchants and customers infection, and through infected merchants and customers caused by domestic transmission.
, 75 cases and infected people have identified the source of infection, the source of infection of three people in a new shi family is being traced.
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