Epidemiological and cluster characteristics of dengue fever in Yunnan province, China, 2013-2020

WEI Chun, GUO Xiao-lian, YANG Rui, TANG Ye-rong, YUE Yu-juan, LIU Xiao-bo, LIU Qi-yong

doi:10.11853/j.issn.1003.8280.2021.06.013

Chinese Journal of Vector Biology and Control >

2021 , Vol. 32 >Issue 6: 720 - 724

DOI: https://doi.org/10.11853/j.issn.1003.8280.2021.06.013

Vector Infectious Disease

Epidemiological and cluster characteristics of dengue fever in Yunnan province, China, 2013-2020

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1. Yunnan Institute of Parasitic Diseases, Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research, Yunnan Institute of Parasitic Diseases Innovative Team of Key Techniques for Vector Borne Disease Control and Prevention(Developing), Pu'er, Yunnan 665099, China;
2. State Key Laboratory of Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, WHO Collaborating Centre for Vector Surveillance and Management, Department of Vector Biology and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China

Received date: 2021-04-19

Online published: 2021-12-15

Supported by

Supported by the State Key Laboratory of Infectious Disease Prevention and Control (China CDC) (No.2021SKLID502) and National Natural Science Foundation of China (No. 81703280)

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Abstract

Objective To investigate the epidemiological and spatial cluster characteristics of dengue fever in Yunnan province, China, and to provide evidence for the formulation and improvement of targeted prevention and control measures in future. Methods The data of dengue cases in Yunnan province from 2013 to 2020 were collected from the China Information System for Disease Control and Prevention. Software ArcMap 10.7 was used to plot the geographical distribution, and software SaTScan v9.3 was used to analyze the spatial clustering. Results A total of 14 031 dengue cases were reported in Yunnan province from 2013 to 2020, including 11 505 indigenous cases, 2 507 overseas imported cases, and 19 cases imported from other provinces. The epidemic showed a "zigzag" increase. The overall spatial scan statistics detected two class I clusters in Jinghong city (log-likelihood ratio[LLR]=22 647.97) and Ruili city (LLR=10 125.08), and two class II clusters in Mengla county (LLR=1 167.76) and Gengma county (LLR=1 061.22). Class I clusters were detected in 2013, 2015, 2017, and 2019. The indigenous cases were found in 10 border counties. The overseas imported cases were mainly from southeast Asian countries and African countries, and Myanmar, Cambodia, and Laos were the main source countries. The reported cases were mainly imported in the first half of the year and were mainly indigenous in the second half of the year. The number of cases began to increase in July, peaked in August to October, and began to decline in November. Among the 14 031 dengue cases, the male/female ratio was 1:0.88, and 79.78% of the cases were aged from 15 to 60 years. The top five occupations in terms of incidence were business services (20.95%), farmers (20.52%), unemployed people (11.17%), retired people (8.97%), and students (7.31%). Conclusion The situation of dengue fever in Yunnan province is serious. It is urgent to do a good job in the control and management of imported cases and the monitoring and control of vector Aedes, thus providing guarantee for sustainable control of dengue fever.

Key words： Yunnan province; Dengue fever; Clusters; Indigenous cases; Imported cases

Cite this article

WEI Chun, GUO Xiao-lian, YANG Rui, TANG Ye-rong, YUE Yu-juan, LIU Xiao-bo, LIU Qi-yong . Epidemiological and cluster characteristics of dengue fever in Yunnan province, China, 2013-2020[J]. Chinese Journal of Vector Biology and Control, 2021 , 32(6) : 720 -724 . DOI: 10.11853/j.issn.1003.8280.2021.06.013

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