Objective To analyze the epidemiological characteristics and the impact of COVID-19 of dengue fever in Longhua District,Shenzhen City,so as to provide reference for the prevention and control of dengue fever in the post-COVID-19 era.Methods The epidemiological data of dengue fever cases from 2017 to 2023 in Longhua District of Shenzhen City were collected and analyzed by descriptive epidemiology.Chi-square,Kruskal-Wallis and Mann-Whitney tests were used to analyze the data differences.Results A total of 130 cases of dengue fever were reported in Longhua District of Shenzhen from 2017 to 2023,including 11 local cases(8.46%)and 119 imported cases(91.54%).The ratio of imported cases to local cases was10.82∶1,and the incidence was0.71/100 000.Imported cases from overseas,imported cases from domestic and local cases were mainly reported from June to August,June to November and September to October,respectively.Overseas imported cases were mainly from Southeast Asia,and domestic imported cases were mainly imported from Guangdong Province.The time interval from onset to diagnosis and from initial visit to diagnosis was longer for local cases than for imported cases,and the difference was statistically significant(H=10.447,P=0.005;H=13.175,P=0.001).The sex ratio of overseas imported cases(7.11∶1)was higher than domestic imported cases(1.71∶1)and local cases(4.50∶1),and the difference was statistically significant(χ2=10.208,P=0.006).The median age of cases was 33 years old(28,42),and the majority of cases were 20-49 years old(84.62%).The occupations of the cases were mainly business service,housework and unemployed,and workers(78.46%).There was significant difference in the occupational distribution of imported cases from overseas,imported cases from domestic and local cases(χ2=39.109,P=0.003).After COVID-19 pandemic,a greater proportion of dengue fever patients had symptoms of muscle soreness or joint pain at the first visit,and the difference was statistically significant(χ2=5.134,P=0.023),the time interval between onset and treatment was longer than that before COVID-19,and the difference was statistically significant(Z=-2.227,P=0.026),the proportion of willing to isolation after COVID-19(48.00%)was significantly lower than that before COVID-19(94.29%),with statistical significance(χ2=27.540,P＜0.001).Conclusion In Longhua District of Shenzhen,imported dengue fever cases were predominant,and local cases were caused by imported cases,which showed significant seasonal characteristics.After COVID-19 pandemic,the dengue has rebounded quickly,appropriate adjustments should be made to relevant prevention and control measures to adapt to the new prevention and control situation.
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