Investigation on an outbreak of dengue fever in an industrial park in Shenzhen

GAN Liqin; YANG Zhiqiang; SHEN Peilin; LIAO Junlei; HE Zhihei; LIU Wuyi; REN Fangmei

doi:10.19821/j.1671-2781.2025.02.016

Abstract：Objective To investigate a local cluster epidemic of dengue fever in an industrial park in Longgang District,Shenzhen,control the outbreak scale of the epidemic,and to understand the process and risk factors of the epidemic.Methods Field epidemiological investigation was used to obtain the information of cases and epidemic sites,and to analyze the occurrence and transmission process of the epidemic.Case information was collected for descriptive epidemiological analysis,and rates were compared using Chi-square test or Fisher's exact test.Results 6 local cases of dengue fever were reported from November 20 to 28,2023.All of them were employees of company A in G park or had worked in the company's office 14 days before the onset of the disease.Room 616 of company A was the epidemic transmission center,and the incidence rate of those who had worked in room 616 was higher,and the difference was statistically significant(Fisher's exact test,P=0.024).The incidence rate of those who had worked in room 616 was 1.67 times than that of those who did not work in the room(95%CI:1.10-2.52).The open waste water buckets and water dispenser storage boxes in room 616 were suspected breeding sites of Aedes albopictus,the vector of transmission in this outbreak.Conclusion This is a local outbreak of dengue fever caused by a large number of Ae.albopictus due to improper treatment of indoor living water,which suggests that attention should be paid to the investigation and remediation of indoor and outdoor environments during the prevention and control of dengue fever,so as to avoid a small-scale outbreak caused by local breeding activities of Ae.albopictus.