Severe dengue outbreak in Yunnan, China, 2013

Zhang, Fuchun; Zhao, Hui; Li, Lihua; Jiang, Tao; Hong, Wei; Wang, Jian; Zhao, Liang; Yang, Huiqin; Ma, Dehong; Bai, C. H.; Shan, Xiyun; Deng, Yong-Qiang; Qin, Cheng‐Feng

doi:10.1016/j.ijid.2014.03.1392

Cited by 65 publications

(66 citation statements)

References 9 publications

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“…The distribution of Ae. aegypti in Xishuangbanna was firstly found in 2013 during dengue epidemic there [1]. From the surveillance results from June to December, 2014, there were 647 positive containers for Ae.…”

Section: Discussionmentioning

confidence: 99%

“…aegypti in Dehong DaiJingpo Autonomous Prefecture, Yunnan province, China. According to previous studies [1], it was reported that Ae. aegypti was detected for the first time in Xishuangbanna, and we found the two important dengue vectors, Ae.…”

Section: Introductionmentioning

confidence: 93%

“…Dengue outbreaks have occurred frequently in Xishuangbanna, Yunnan province during recent years, since the first serious dengue outbreak in 2013 [1]. According to previous studies [2,3], the distribution of Aedes aegypti in China is only limited in some areas in Guangdong, Guangxi and Hainan provinces.…”

Section: Introductionmentioning

confidence: 99%

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Coexistence of Aedes aegypti and Aedes albopictus in Jinghong City, Yunnan Province: A Survey of Aedes aegypti Invasion

Guo¹,

Lai²,

Huang³

et al. 2016

J Trop Dis

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We conducted this study to confirm that Aedes aegypti has invaded and colonized in Xishuangbanna, Yunan province, China. And we conducted a larval survey for dengue mosquito vectors, Ae. aegypti and Ae. albopictus, to assess on possible competition for breeding sites between these both species in urban environment in Jinghong city. The study was carried out at least once a month in February and March, November and December, and three times for each month from April to October in 2014 in five communities in the municipality of Jinghong city. No less than 50 houses were surveyed each time in one place. We collected immature stages of mosquitoes from all types of breeding sites in houses and their premises. Morphological species identification was carried for Ae. aegypti and Ae. albopictus. Both species occurred in all surveyed areas. Aedes aegypti has occupied a considerable composition (67.75%) since the uncertain time of its first invasion to Jinghong city. Aedes aegypti was predominant species indoor (74.19%), but also presented in surrounding environment (25.81%); while Ae. albopictus favored the outdoor environment (54.55%) as well as in houses (45.45%). We gave the preference water containers (tires) for dengue vectors, described different distribution in different investigated places, and showed with monthly variance by indices of BI and CI. We gave our rational explanation for the variance with raining in this area; Aedes keep a high density value during the rainy season. For both dengue vectors, the possibility cannot be excluded that the invasion of Ae. aegypti in the city might lead to a decrease or elimination of Ae. albopictus in houses and dwellings. Furthermore, we also found that both dengue vectors have already occupied the breeding sites in houses and their premises with water container in Jinghong city, and both should be managed during dengue epidemic season. These findings from this study are relevant for dengue vector control programs.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

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Coexistence of Aedes aegypti and Aedes albopictus in Jinghong City, Yunnan Province: A Survey of Aedes aegypti Invasion

Guo¹,

Lai²,

Huang³

et al. 2016

J Trop Dis

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“…Three individual studies have reported the dengue outbreaks occurred in Yunnan and Henan Provinces in 2013 [19–21]. However, no study tried to explore the transmission dynamics between locations.…”

Section: Introductionmentioning

confidence: 99%

The Epidemiological Characteristics and Dynamic Transmission of Dengue in China, 2013

Sang

Wang

et al. 2016

PLoS Negl Trop Dis

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BackgroundThere was a dengue epidemic in several regions of China in 2013. No study has explored the dynamics of dengue transmission between different geographical locations with dengue outbreaks in China. The purpose of the study is to analyze the epidemiological characteristics and to explore the dynamic transmission of dengue in China, 2013.Methodology and Principal FindingsRecords of dengue cases of 2013 were obtained from the China Notifiable Disease Surveillance System. Full E-gene sequences of dengue virus detected from the outbreak regions of China were download from GenBank. Geographical Information System and heatmaps were used to describe the epidemiological characteristics. Maximum Likelihood phylogenetic and Bayesian phylogeographic analyses were conducted to explore the dengue dynamic transmission. Yunnan Province and Guangdong Province had the highest imported cases in the 2013 epidemic. In the locations with local dengue transmission, most of imported cases occurred from June to November 2013 while local dengue cases developed from July to December, 2013. There were significant variations for the incidences of dengue, in terms of age distributions, among different geographic locations. However, gender differences were identified in Guangzhou, Foshan and Xishuangbanna. DENV 1–3 were detected in all locations with the disease outbreaks. Some genotypes were detected in more than one locations and more than one genotypes have been detected in several locations. The dengue viruses introduced to outbreak areas were predominantly from Southeast Asia. In Guangdong Province, the phylogeographical results indicated that dengue viruses of DENV 1 were transmitted to neighboring cities Foshan and Zhongshan from Guangzhou city, and then transmitted to Jiangmen city. The virus in DENV 3 was introduced to Guangzhou city, Guangdong Province from Xishuangbanna prefecture, Yunnan Province.ConclusionsRepeated dengue virus introductions from Southeast Asia and subsequent domestic dengue transmission within different regions may have contributed to the dengue epidemics in China, 2013.

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“…Aedes albopictus, the primary vector for DENV in Guangdong, can transmit DENV transovarially, thus overwintering mosquitoes may serve as potential source of dengue to initiate a new infection cycle. Importantly, Aedes aegypti, the more effective DENV vector than Aedes albopictus, has been introduced and colonized southern regions of China, including Yunnan and Guangdong provinces [2]. It is likely that DENV will establish its infection in Chinese Aedes aegypti, which can further deteriorate the current situation.…”

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confidence: 99%