Abstract: Objective     To analyze the epidemiological characteristics of dengue fever cases in Songjiang District of Shanghai for scientific evidences in prevention and control of this infection. Methods     Cases of dengue fever reported in Songjiang District were retrieved from the National Disease Surveillance Information System during 2014-2020. Descriptive epidemiological method was used to analyze the epidemiological properties, including the time, space and population distribution of the cases. Results     Totally, 20 dengue fever cases were reported in Songjiang District from 2014 to 2020, all of which were imported cases. There were no local cases and no deaths. The cases were generally imported from Southeast Asian countries, which accounted for 95.0% of all reported cases （19/20）. Temporal distribution presented in unimodal fashion, and was peaked in July and August. The male to female ratio was 4：1, and the median age was 37 years old for the infections, with the young and middle aged being dominant （65.0%). Occupation with dengue infection was associated with company employees （35.0%）, business services （20.0%） and workers（20.0%）. The imported cases were reported from 7 of the 15 blocks/towns within Songjiang District. The interval of median days for the 20 cases was 6 d from onset to final diagnosis. Laboratory studies revealed that the infection was involved in DENV-1 and DENV-2, with DENV-2 being dominant （71.4%）. Conclusion     The dengue fever epidemic in Songjiang District of Shanghai is dominated by imported infection, and evidently presents in seasonal fashion. The findings suggest that the prevention and control measures should be focused on management of imported infection as well as local prevalence and epidemic.

Key words: Dengue fever, Imported cases, Epidemiology features, Songjiang district