Ixodes scapularis tick distribution and infection rates in Ottawa, Ontario, 2017.

Manisha A. Kulkarni, R. Kryuchkov, A. Statculescu, C. Thickstun, A. Dibernardo, L. Lindsay, Benoit Talbot
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引用次数: 14

Abstract

Background The incidence of Lyme disease has increased in many regions of Canada in recent years, including in Ottawa, Ontario. To date there has been limited active tick surveillance in the region. Objectives To estimate both the distribution and density of Ixodes scapularis ticks in the city of Ottawa, and the infection rates of ticks with Borrelia burgdorferi (that causes Lyme disease) and other tick-borne pathogens. Methods Between June and October 2017, tick surveillance was conducted by drag sampling at 23 sites in Ottawa municipal parks, recreational trails and forests. Blacklegged ticks were tested for B. burgdorferi, Borrelia miyamotoi and Anaplasma phagocytophilum using quantitative polymerase chain reaction protocols. Results I. scapularis ticks were found in 16 of the 23 sites (70%). Recreational trails, conservation areas/forests and the provincial park within the city of Ottawa had significantly higher tick densities than municipal parks (p<0.01). Of the 194 adult and 26 nymphal I. scapularis tested, prevalence of infection was 29.5% for B. burgdorferi, 0.45% for B. miyamotoi and 0.91% for A. phagocytophilum. Conclusion Almost 30% of I. scapularis ticks tested in suburban and rural areas of the city of Ottawa were infected with B. burgdorferi, known to cause Lyme disease. Other types of infection, known to cause anaplasmosis and tick-borne relapsing fever, were also detected, although were very rare. Conducting active tick surveillance at the local level may help to inform risk assessment and public health actions.
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2017年安大略省渥太华地区肩胛棘蜱分布及感染率分析
近年来,包括安大略省渥太华在内的加拿大许多地区的莱姆病发病率有所增加。迄今为止,在该地区进行了有限的主动蜱虫监测。目的了解渥太华市肩胛骨蜱的分布和密度,以及伯氏疏螺旋体(导致莱姆病)和其他蜱传病原体的感染率。方法2017年6月至10月,在渥太华市政公园、休闲步道和森林的23个地点进行蜱虫监测。采用定量聚合酶链反应方法对黑腿蜱进行了伯氏疏螺旋体、宫本氏疏螺旋体和嗜吞噬细胞无形体的检测。23个地点中有16个(70%)发现肩胛骨蜱。休闲步道、保护区/森林和渥太华市立公园的蜱虫密度显著高于市立公园(p<0.01)。在194只成虫和26只若虫中,伯氏疏螺旋体感染率为29.5%,宫氏疏螺旋体感染率为0.45%,嗜吞噬细胞疏螺旋体感染率为0.91%。结论在渥太华市郊区和农村地区,近30%的镰形蜱感染了已知的引起莱姆病的伯氏疏螺旋体。已知引起无形体病和蜱传回归热的其他类型感染也被发现,尽管非常罕见。在地方一级开展主动蜱虫监测可能有助于为风险评估和公共卫生行动提供信息。
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