Murty U Suryanarayana, Rao M Srinivasa, Arunachalam N
Biology Division, Indian Institute of Chemical Technology (CSIR), Hyderabad, India.
J Vector Borne Dis. 2010 Mar;47(1):26-32.
BACKGROUND & OBJECTIVES: Climatic attributes have been associated with relative mosquito abundance and transmission of mosquito borne infections in many parts of the world, especially in warm and tropical climatic regions. The main objectives of this study were to assess the change in seasonal pattern of Japanese encephalitis (JE) vectors, their density, to elucidate whether the lagged climate variables (precipitation, temperature and humidity) are associated with JE vector density, and to determine if temperature and precipitation are similarly important for the rise in the number of potential mosquito vectors for JE virus in the temperate climate of Andhra Pradesh, India.
Mosquito samples were collected from Kurnool district of Andhra Pradesh using hand catch and light-trap methods during 2002 to 2006. The type and abundance of recovered species were compared to ecological correlates. In each geographic area, temperature and precipitation are the two possible proxy variables for mosquito density, in conjunction with other seasonal factors for JE epidemics.
Out of the various mosquito species collected, Culex gelidus and Cx. tritaeniorhynchus were noticed in high numbers. There was considerably high prevalence of Cx. gelidus (68.05%) in urban area than in rural areas whereas, Cx. tritaeniorhynchus (57.51%) was found to be more in rural areas than in the urban area. It is noticed that the factors such as rainfall and temperature were found to be correlated with the per man hour (PMH) density, whereas the humidity was inversely correlated with the PMH.
INTERPRETATION & CONCLUSION: The environmental and eco-climatic factors are assisting in enhancing the breeding of these mosquitoes in Kurnool district of Andhra Pradesh, India. Both Cx. tritaeniorhyncus and Cx. gelidus are quite adaptable to these environmental conditions and this necessitates immediate control measures in both rural and urban areas of Kurnool district.
在世界许多地区,尤其是温暖和热带气候区域,气候特征与蚊子相对丰度及蚊媒感染传播有关。本研究的主要目的是评估日本脑炎(JE)媒介的季节模式变化及其密度,阐明滞后的气候变量(降水、温度和湿度)是否与JE媒介密度相关,并确定在印度安得拉邦的温带气候中,温度和降水对JE病毒潜在蚊媒数量增加是否同样重要。
2002年至2006年期间,采用人工捕捉和灯光诱捕方法从印度安得拉邦库尔努尔区采集蚊子样本。将捕获物种的类型和丰度与生态相关因素进行比较。在每个地理区域,温度和降水是蚊子密度的两个可能替代变量,同时考虑JE流行的其他季节因素。
在所采集的各种蚊子物种中,尖音库蚊和三带喙库蚊数量较多。尖音库蚊在城市地区的患病率(68.05%)显著高于农村地区,而三带喙库蚊在农村地区的患病率(57.51%)高于城市地区。据观察,降雨和温度等因素与每人工小时(PMH)密度相关,而湿度与PMH呈负相关。
环境和生态气候因素有助于印度安得拉邦库尔努尔区这些蚊子的繁殖。三带喙库蚊和尖音库蚊都非常适应这些环境条件,这就需要在库尔努尔区的农村和城市地区立即采取控制措施。