Abstract
New spatial characteristics of dengue fever in mainland China during 2019 were analyzed. There was a dengue fever outbreak in mainland China in 2019, with 15,187 indigenous cases in 13 provinces, 1281 domestic imported cases from 12 provinces and 5778 overseas imported cases from 47 countries, more than the previous cases during the period 2005–2018, except for in 2014. Indigenous cases occurred in Sichuan, Hubei and Chongqing in 2019. There have been big changes in the spatial distribution and proportion of dengue cases. Indigenous cases were not only located in the southwestern border and southeastern coastal provinces of Yunnan, Guangdong, Guangxi and Fujian but also in the central provinces of Jiangxi and Chongqing. Domestic imported cases were not only from Guangdong, but also from Yunnan. There were five new sources of importation of cases. Overseas imported cases were mainly from Cambodia and Myanmar in 2019. Understanding the new spatial characteristics of dengue fever in China helps to formulate targeted, strategic plans and implement effective public health prevention and control measures.
Highlights
Dengue fever, mainly transmitted by Aedes mosquitoes, is one of the most prevalent mosquito-borne diseases in humans [1]
Dengue cases were defined based on laboratory confirmation and clinical diagnosis according to the diagnostic criteria and the principles of management for dengue [16,17]
Dengue case reports from 1 January 2019 to 18 December 2019 were obtained from the CNNDS
Summary
Mainly transmitted by Aedes mosquitoes, is one of the most prevalent mosquito-borne diseases in humans [1]. Dengue fever is endemic in more than 100 countries in Southeast Asia, the Americas, the Western Pacific, Africa and the Eastern Mediterranean regions, evolving from a sporadic disease to a major public health problem with increasing geographic extension, numbers of cases and disease severity [3]. Despite a risk of dengue infection existing in 129 countries [5], 70% of the actual burden is in Asia [6]. According to an estimation made in 2013, 390 million people had dengue virus infections, and there were 96 million dengue cases annually worldwide (at any level of clinical or sub-clinical severity) [1], more than three times the dengue burden estimate of the World Health Organization (WHO) [7]
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