Epidemiology and Vector Efficiency During a Dengue Fever Outbreak in Cixi, Zhejiang Province, China

Abstract

An emigrant worker returning from Southeast Asia triggered the outbreak of a DF epidemic in Zhejiang province, China, in October, 2004. Eighty-three cases, mainly young and middle-aged people between 20 and 50 (78.3%), were reported in the area of Cixi. There were no obvious occupational patterns. The majority of cases were female, with a sex ratio of 1:1.86 (m:f). The dengue virus (DENV) strains from the epidemic area were isolated and identified as DENV-1, which belongs to Asian strain 1. According to the epidemiological investigation, the incidence of DF had no relationship to temperature, humidity, or precipitation, and the Breteau index of larvae showed a clear relationship only with the House Index and Container Index. Recent dengue problems in the town have been associated with the complex social factors and hygienic conditions for endemic villagers and immigrant workers. Some hygienic measures should be taken by the local government to reduce the risk of mosquito-borne disease. These measures should aim to eliminate the breeding sites of the vector Aedes albopictus in indoor and outdoor containers filled with rainwater and thus reducing the risk of DF transmission.

Dengue transmission in the Asia‐Pacific region: impact of climate change and socio‐environmental factors

“…Temperature, rainfall and relative humidity were often major determinants of dengue transmission. There was no association between dengue incidence and climate variability in Cixi, China, which might be attributed to the non‐endemic nature of DF in Cixi and the short study period (4 months) (Yang et al. 2009).…”

“…2010) and three descriptive analyses (Chakravarti & Kumaria 2005; Bangs et al. 2006; Yang et al. 2009).…”

Epidemiological, virological, and entomological characteristics of dengue from 1978 to 2009 in Guangzhou, China

“…This may be partly due to the fact that the Ae. albopictus feeds preferentially on human blood in the day time (Yang et al 2009), whereas the surveillance of Aedes started mainly in the late afternoon. However, in contrast to the annual adult and larval density index, monthly fluctuations in immature (BI, HI, and MOI) paralleled the seasonal cyclic pattern of the incidence of dengue during both epidemic and non‐epidemic years.…”

“…There had been no evidence of dengue outbreaks in China's mainland during 1949–1977. However, a dramatic geographic expansion of epidemic DF from southeast Asian countries west to India, Sri Lanka, the Maldives, and Pakistan and east to China (Yang et al 2009) have been seen in the past two decades. An outbreak of dengue in Foshan city (contiguous to Guangzhou) of Guangdong province in 1978 started the endemic of dengue in southern China, including Guangdong, Guangxi, Hainan, Taiwan, Fujian, and Zhejiang (Wen et al 1998).…”

Synthesis, Biological Activity of Pyrimidine Linked with Morpholinophenyl Derivatives

“…The main vector of these diseases is the mosquito Aedes aegypti ( Ae. aegypti ) that transmits dengue fever, dengue hemorrhagic fever, and yellow fever over many areas of tropics and subtropics . Among them dengue fever is the most dangerous and case list is also increasing day by day .…”