库克硬蜱若虫和美洲钝缘蜱若虫（蜱螨亚纲：硬蜱科）传播伯氏疏螺旋体的能力缺失。
Inability of Ixodes cookei and Amblyomma americanum nymphs (Acari: Ixodidae) to transmit Borrelia burgdorferi.
作者信息
Ryder J W, Pinger R R, Glancy T
机构信息
Department of Physiology and Health Science, College of Sciences and Humanities, Ball State University, Muncie, Indiana 47306-0510.
出版信息
J Med Entomol. 1992 May;29(3):525-30. doi: 10.1093/jmedent/29.3.525.
The vector competency of Ixodes cookei Packard and Amblyomma americanum (L.) for Borrelia burgdorferi was studied using Syrian hamsters. Ixodes dammini Spielman, Clifford, Piesman & Corwin were used as controls. Darkfield and immunofluorescent examinations of midgut diverticula revealed B. burgdorferi spirochetes in 32 of 36 (88.9%) I. dammini larvae, 5 of 36 (13.9%) I. cookei larvae, and 7 of 36 (19.4%) A. americanum larvae within 48 h after feeding on infected Syrian hamsters. B. burgdorferi were also observed in the midguts of 94 of 107 (87.8%) I. dammini nymphs that developed from the fed larvae. However, none of 30 I. cookei nymphs was positive for spirochetes and only 1 of 60 (1.7%) A. americanum nymphs was found positive for B. burgdorferi. Nymphs of each tick species, reared from larvae that had fed on infected hamsters, were allowed to feed on uninfected hamsters to determine their ability to transmit B. burgdorferi. Transmission was demonstrated only by I. dammini nymphs.
利用叙利亚仓鼠研究了库克硬蜱（Ixodes cookei Packard）和美洲钝缘蜱（Amblyomma americanum (L.)）传播伯氏疏螺旋体（Borrelia burgdorferi）的媒介能力。以达敏硬蜱（Ixodes dammini Spielman, Clifford, Piesman & Corwin）作为对照。对中肠憩室进行暗视野和免疫荧光检查发现，在以感染的叙利亚仓鼠为食后48小时内，36只达敏硬蜱幼虫中有32只（88.9%）、36只库克硬蜱幼虫中有5只（13.9%）、36只美洲钝缘蜱幼虫中有7只（19.4%）的中肠憩室中发现了伯氏疏螺旋体螺旋体。从喂食后的幼虫发育而来的107只达敏硬蜱若虫中，有94只（87.8%）的中肠也观察到了伯氏疏螺旋体。然而，30只库克硬蜱若虫均未检测到螺旋体呈阳性，60只美洲钝缘蜱若虫中只有1只（1.7%）检测到伯氏疏螺旋体呈阳性。将以感染仓鼠为食的幼虫饲养而来的各蜱种若虫，让其叮咬未感染的仓鼠，以确定它们传播伯氏疏螺旋体的能力。结果表明，只有达敏硬蜱若虫能够传播。
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