Epidemiological and genetic characteristics analysis of abroad imported COVID-19 in Jinan from June to December,2022
Objective To analyze the epidemical and genomic characteristics of abroad imported SARS-CoV-2,so as to provide scientific basis for the epidemic prevention and control at Jinan port.Methods The epidemiological characterization of information related to SARS-CoV-2 infections imported from abroad from June to December 2022 was collected from Jinan port.Seventy-seven infections'samples were screened for high-throughput sequencing using the second-generation sequencing technology analyzed for genotyping and variant features.Results A total of 165 cases of imported asymptomatic SARS-CoV-2 infection were reported at Jinan port,with a gender ratio of 2.17∶1,av-erage age 37.46 years old,67.27％of those infected had been vaccinated.Occupations were mainly migrant workers,accounted for 26.67％.The main source country was South Korea,accounted for 21.21％.The 77 effective whole genome sequences could be divided into 8 types according to Nextstrain typing,all of which were Omicron variants,and the dominant evolutionary branches were BA.2,BA.5.2 and BA.5.10.1.Phylogenetic tree analysis showed that the sequences of imported SARS-CoV-2 infections were highly homologous to those of the source countries.Conclusion The risk of overseas importation of SARS-CoV-2 at Jinan port will continue to exist.Mutation surveillance and pre-vention and control measures still need to be persevered while tracking the epidemic situation in a timely manner.
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