Canyon D V, Muller R, Hii J L K
Department of Public Health Sciences, John A. Burns School of Medicine, University of Hawaii at Manoa, 1960 East-West Rd, Biomed Building #D104B. Honolulu, HI 96822, USA.
Trop Biomed. 2013 Mar;30(1):1-8.
Weather variations have clear associations with the epidemiology of dengue fever and populations of Aedes aegypti mosquitoes. Data on humidity associations, however, lags with respect to its effect on host-biting, nectar-seeking and survival. This experimental study on Ae. aegypti, sourced from the arid tropics, investigated the effect of low and high relative humidity and diet in relation to host-biting, temporal variations in feeding frequency, and mosquito mortality. In each environmental setting, 10 replicates, containing one male and five female mosquitoes, were challenged with different nutritional sources every six hours over 12 days. Results showed that host-biting did not diminish in low humidity and was six times higher than expected. Sucrose feeding was observed to significantly moderate host-biting and water alone was inadequate for survival. The high host-biting rates help to explain the intensity of dengue epidemics, while the ability of the mosquito to disregard adverse humidity-related conditions helps to explain how dengue epidemics in arid tropical regions can be just as devastating as those in the wet tropics.
天气变化与登革热的流行病学以及埃及伊蚊的种群数量有着明确的关联。然而，关于湿度关联的数据在其对宿主叮咬、采蜜和生存的影响方面滞后。这项针对源自干旱热带地区的埃及伊蚊的实验研究，调查了低湿度和高湿度以及饮食与宿主叮咬、进食频率的时间变化和蚊子死亡率之间的关系。在每个环境设置中，设置了10个重复样本，每个样本包含1只雄蚊和5只雌蚊，在12天内每6小时用不同的营养源进行一次挑战。结果表明，在低湿度环境下宿主叮咬并未减少，且比预期高出6倍。观察到蔗糖喂养能显著缓解宿主叮咬，仅靠水不足以维持生存。高宿主叮咬率有助于解释登革热疫情的强度，而蚊子无视与湿度相关的不利条件的能力有助于解释干旱热带地区的登革热疫情为何会与潮湿热带地区的疫情一样具有毁灭性。
