Epidemiological characteristics of imported SARS-CoV-2 infection cases from abroad in Fuzhou city
Objective To analyze the epidemiological characteristics of imported SARS-CoV-2 infection cases from abroad in Fuzhou,to provide the scientific basis for the prevention and control.Methods The data of imported SARS-CoV-2 infection cases from abroad was collected from China information system for disease control and prevention during March 17 in 2020 to June 30 in 2023.The data of those cases was investigated by face-to-face,including the source countries/regions of infection,the vaccination,positive time after entry and the time to cure.The positive recovery was investigated through the follow-up.Results Since the first imported SARS-CoV-2 infection case from abroad was reported on March 17,2020 in Fuzhou,as of June 30 in 2023,980 imported cases had been reported including 753 asymptomatic infected cases(76.84％)and 227 confirmed cases(23.16％).The peak appeared in September in 2020,January in 2021,March,August and November in 2022.The highest peak was in November in 2022,with a number of 126 cases.The 4 most important sources of infection were Indonesia(202/980,20.61％),Japan(188/980,19.18％),Hong Kong,China(176/980,17.96％)and the United States(154/980,15.71％).Most of the cases were male and middle-aged.The mean age was(39.56±14.92)years,the average age of confirmed cases was higher than that of asymptomatic infection cases(t=2.433,P=0.015).The vaccination rate of asymptomatic infection cases(617/753,81.94％)was higher than that of confirmed cases(166/227,73.13％)(x2=8.431,P=0.004).The positive time of most cases was mainly found in 3 days after entry.The median value of nucleic acid detection Ct was 30.70,the median Ct value of confirmed cases(26.95)was lower than that of asymptomatic infection cases(31.40)(Z=6.656,P＜0.001).The median time to cure was 16.00 days,the cure time for confirmed cases(22.00 days)was longer than that for asymptomatic infection cases(16.00 days)(Z=9.081,P＜0.001).The general positive recovery rate was 11.12％(109/980),the positive recovery rate of confirmed cases(37/227,16.30％)was higher than that of asymptomatic infected cases(72/753,9.56％)(x2=8.010,P=0.005).Conclusion Most of the imported SARS-CoV-2 infection cases from abroad were male,middle-aged and asymptomatic infected.The cases mainly came from Indonesia,Japan,Hong Kong,China and the United States.Compared to asymptomatic infection cases,the vaccination rate and nucleic acid detection Ct value were lower,the average age,positive time after entry,cure time and positive recovery rate were higher than confirmed cases.
SARS-CoV-2Imported from abroadEpidemiological characteristicAsymptomatic infection caseConfirmed case
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万方数据
