Weisbrod A R, Johnson R C
St. Croix National Riverway, Spring Creek Field Laboratory, Minnesota 55047.
Appl Environ Microbiol. 1989 Aug;55(8):1921-4. doi: 10.1128/aem.55.8.1921-1924.1989.
During a study of migrating land birds in 1987, we examined over 9,200 individual birds representing 99 species from the Saint Croix River Valley, a Lyme disease-endemic area of east central Minnesota and northwestern Wisconsin. We found that 250 deer tick (Ixodes dammini) larvae and nymphs infested 58 birds from 15 migrant species; 56 ticks (22.4%) were positive for the Lyme disease spirochete Borrelia burgdorferi. Five ground-foraging migrant bird species favoring mesic habitats, veery (Catharus fuscescens), ovenbird (Seiurus aurocapillus), northern waterthrush (S. novaboracensis), common yellowthroat (Geothlypis trichas), and swamp sparrow (Melospiza georgiana), accounted for nearly three-quarters of parasitized individuals. Nearly half of the spirochete-positive ticks were removed from migrating birds taken in a riparian floodplain forest. Recaptured migrants with infected ticks indicate that they transmit B. burgdorferi to hexapod larvae. We suggest that birds may be both an important local reservoir in the upper Mississippi Valley and long-distance dispersal agents for B. burgdorferi-infected ticks to other regions of the continent.
1987年在一项对迁徙陆鸟的研究中，我们检查了9200多只个体鸟类，它们代表了来自圣克罗伊河谷的99个物种，该河谷是明尼苏达州中东部和威斯康星州西北部的莱姆病流行区。我们发现，250只鹿蜱（达氏硬蜱）幼虫和若虫寄生在15种候鸟的58只鸟类身上；56只蜱（22.4%）检测出莱姆病螺旋体伯氏疏螺旋体呈阳性。五种偏好中生栖息地的地面觅食候鸟，即褐林鸫（Catharus fuscescens）、灶鸟（Seiurus aurocapillus）、北水鸫（S. novaboracensis）、普通黄喉地莺（Geothlypis trichas）和沼泽雀鹀（Melospiza georgiana），占了被寄生个体的近四分之三。近一半的螺旋体阳性蜱是从河岸洪泛平原森林中捕获的候鸟身上采集到的。带有感染蜱的重新捕获的候鸟表明，它们将伯氏疏螺旋体传播给六足幼虫。我们认为，鸟类可能既是密西西比河上游地区重要的本地宿主，也是伯氏疏螺旋体感染蜱向该大陆其他地区远距离传播的媒介。
