Tälleklint L, Jaenson T G
Department of Zoology, University of Uppsala, Sweden.
J Med Entomol. 1996 Jul;33(4):592-7. doi: 10.1093/jmedent/33.4.592.
Seasonal variations in the density of questing Ixodes ricinus (L.) nymphs and their prevalence of infection with Borrelia burgdorferi s.l. Johnson, Schmid, Hyde, Steigerwalt & Brenner were studied during 1991-1993 at a locality in southcentral Sweden. The seasonal pattern of the density of questing I. ricinus nymphs was variable; there was a bimodal pattern with peaks of similar magnitude in 1991, a bimodal pattern with a small spring peak and a greater autumn peak in 1992, and a unimodal pattern with a spring peak and lower values during summer and autumn in 1993. The seasonal pattern of prevalence of Borrelia infection in questing nymphs was similar during all 3 yr, with a peak infection prevalence in late spring or early summer, followed by lower infection prevalences in late summer and autumn. There was a significant correlation between the monthly density of Borrelia-infected nymphs and the monthly density of nymphs. This suggests that, within a certain range of nymphal densities, it may be possible to assess the density of Borrelia-infected I. ricinus nymphs without examining nymphs for B. burgdorferi s.l.
1991年至1993年期间，在瑞典中南部的一个地点研究了饥饿的蓖麻硬蜱若虫的密度季节性变化及其感染伯氏疏螺旋体（Borrelia burgdorferi s.l. Johnson, Schmid, Hyde, Steigerwalt & Brenner）的患病率。饥饿的蓖麻硬蜱若虫密度的季节性模式各不相同；1991年呈双峰模式，峰值大小相似；1992年呈双峰模式，春季峰值小，秋季峰值大；1993年呈单峰模式，春季有峰值，夏季和秋季值较低。在所有3年中，饥饿若虫中伯氏疏螺旋体感染患病率的季节性模式相似，在春末或初夏感染患病率最高，随后在夏末和秋季感染患病率较低。感染伯氏疏螺旋体的若虫月密度与若虫月密度之间存在显著相关性。这表明，在一定范围内的若虫密度下，有可能在不检测若虫是否感染伯氏疏螺旋体的情况下评估感染伯氏疏螺旋体的蓖麻硬蜱若虫的密度。
