Kitron U, Jones C J, Bouseman J K
College of Veterinary Medicine, University of Illinois, Urbana 61801.
J Parasitol. 1991 Dec;77(6):945-9.
Infestation by immature Ixodes dammini and infection by Borrelia burgdorferi of the white-footed mouse Peromyscus leucopus were studied in Castle Rock State Park in northwestern Illinois during June-October 1990. Prevalence and intensity of infestation of larvae on mice were highest in August with a smaller peak in early June. The distribution of larvae on mice was highly aggregated during each of the sampling periods. Aggregation appears to be the result of a series of nonrandom successful attachments by single larvae, rather than of simultaneous attachment by clumps of larvae. Infection rate of mice by B. burgdorferi averaged 21.4% with a peak of 28.6% in August. A comparison of the numbers of attached immature ticks collected from mice and of questing ticks collected through dragging indicated that the larvae-to-nymph ratio was higher on mice than on drags. Given the low total numbers of nymphs collected from mice, this suggests a potential role for other hosts of I. dammini nymphs in northwestern Illinois.
1990年6月至10月期间，在伊利诺伊州西北部的卡斯尔岩州立公园对白足鼠（Peromyscus leucopus）感染未成熟的达氏硬蜱（Ixodes dammini）以及感染伯氏疏螺旋体（Borrelia burgdorferi）的情况进行了研究。8月小鼠幼虫的感染率和感染强度最高，6月初有一个较小的峰值。在每个采样期间，幼虫在小鼠身上的分布高度聚集。聚集似乎是单个幼虫一系列非随机成功附着的结果，而不是幼虫团块同时附着的结果。小鼠感染伯氏疏螺旋体的平均感染率为21.4%，8月达到峰值28.6%。对从小鼠身上采集的附着未成熟蜱的数量与通过拖拽采集的宿主蜱数量进行比较表明，小鼠身上的幼虫与若虫的比例高于拖拽采集的情况。鉴于从小鼠身上采集到的若虫总数较低，这表明伊利诺伊州西北部达氏硬蜱若虫的其他宿主可能发挥了作用。
