Turell M J, Bailey C L, Rossi C A
Am J Trop Med Hyg. 1984 Nov;33(6):1232-8. doi: 10.4269/ajtmh.1984.33.1232.
Experiments were conducted to determine whether or not mosquitoes exhibited an increase in feeding on Rift Valley fever (RVF) virus-infected lambs as compared to uninfected ones. Overall, when given a choice between a viremic lamb, or its uninfected twin, 65% (1,264/1,943) of the engorged female Culex pipiens obtained blood from the viremic lamb. This excess of feedings on viremic lambs was demonstrated regardless of the age of the lambs, or the time period between inoculation of the lambs and exposure to mosquitoes. With 3-day-old and 6- to 8-week-old lambs, 66% of the mosquitoes obtained blood from the viremic lamb. At 28, 48, and 52 hours after infection, the percentages of mosquitoes feeding on viremic lambs were 72, 68, and 64, respectively. Temperature, as measured by the difference in temperature of the viremic lamb minus that of the control lamb, was positively correlated with mosquito feedings on young lambs (3 days old), but not on older lambs (6 to 8 weeks old). When Cx. pipiens and Aedes taeniorhynchus were simultaneously given the opportunity to feed on 3-week-old lambs, a significantly higher percentage of engorged Cx. pipiens (94/108, 87%) fed on the viremic lamb than did engorged Ae. taeniorhynchus (187/350, 53%). The data generated by this study (e.g., an excess of feedings on the viremic lambs) warrant further study to determine the significance of this observation under field conditions.
开展了实验以确定蚊子吸食感染裂谷热（RVF）病毒的羔羊的情况与未感染羔羊相比是否有所增加。总体而言，当在感染病毒的羔羊或其未感染的双胞胎之间进行选择时，65%（1264/1943）饱血的雌性致倦库蚊从感染病毒的羔羊身上获取血液。无论羔羊的年龄，或羔羊接种病毒与接触蚊子之间的时间段如何，都证实了蚊子对感染病毒羔羊的吸食过量。对于3日龄和6至8周龄的羔羊，66%的蚊子从感染病毒的羔羊身上获取血液。在感染后28、48和52小时，吸食感染病毒羔羊血液的蚊子百分比分别为72%、68%和64%。通过感染病毒的羔羊与对照羔羊的温度差测量的温度，与幼龄羔羊（3日龄）的蚊子吸食呈正相关，但与老龄羔羊（6至8周龄）无关。当致倦库蚊和带喙伊蚊同时有机会吸食3周龄羔羊的血液时，饱血的致倦库蚊（94/108，87%）从感染病毒的羔羊身上吸食血液的比例显著高于饱血的带喙伊蚊（187/350，53%）。本研究产生的数据（例如，对感染病毒羔羊的吸食过量）值得进一步研究，以确定这一观察结果在野外条件下的意义。
