Abstract: Objective To analyze the results of tick ecological surveillance in Zhejiang province, China, 2017-2020, to understand species composition, density and seasonal fluctuation of ticks in Zhejiang province, and to provide a basis for the development of control measures. Methods Twelve surveillance sites for ticks were set up in Zhejiang province. Parasitic ticks were monitored by tick inspection on the body surface of animal and the questing ticks were monitored using drag-flag method. Ticks collected from the same sampling sites or animals were numbered uniformly or placed in the same tube and brought back to the laboratory for classification, identification, and counting. The monitoring data were processed and analyzed using Excel 2010 software. Results The parasitic tick index was 2.25 and the questing tick density was 0.48 ticks/flag·100 m in Zhejiang province, 2017-2020. Haemaphysalis longicornis was the dominant parasitic and questing tick. Among host animals, sheep had the highest tick index (4.29), followed by cattle (1.33). The dominant tick species were H. longicornis on sheep, Rhipicephalus microplus on cattle, H. longicornis on rural dogs, and R. sanguineus on urban dogs. The questing tick density was 0.94 ticks/flag·100 m in rural environment and 0.04 ticks/flag·100 m in scenic area. The tick density in Zhejiang province showed no obvious seasonal fluctuation. Conclusion In 2017-2020, the dominant tick species in Zhejiang province was H. longicornis. The dominant parasitic tick species varied across host animals, and sheep had the highest tick infestation rate. The questing tick density in rural environment was significantly higher than that in scenic area. The results can provide a reference for the public health institutions of Zhejiang province to formulate targeted tick and tick control measures.

Key words: Ticks, Surveillance, Density, Host animals

摘要： 目的 对浙江省2017－2020年蜱生态学监测结果进行分析，了解浙江省蜱种构成、密度及季节消长规律，为蜱的防控措施制定提供依据。方法 在浙江省设置12个蜱监测点，采用动物体表检蜱法开展寄生蜱监测，采用布旗法开展游离蜱监测。每一样地或宿主检获的蜱放入同一管内或做一致编号，带回实验室进行分类鉴定和计数。采用Excel 2010软件进行数据的整理及统计分析。结果 2017－2020年浙江省寄生蜱指数为2.25，游离蜱密度为0.48只/（布旗·100 m）。寄生蜱和游离蜱的优势蜱种均为长角血蜱。不同宿主动物中，羊的蜱指数最高，为4.29，其次为牛，蜱指数为1.33。羊体表优势蜱种为长角血蜱，牛体表优势蜱种为微小扇头蜱，农村犬体表优势蜱种为长角血蜱，城镇犬体表优势蜱种为血红扇头蜱。农村外环境游离蜱密度为0.94只/（布旗·100 m），景区环境游离蜱密度为0.04只/（布旗·100 m）。浙江省蜱密度未发现明显的季节消长规律。结论 浙江省优势蜱种为长角血蜱。不同宿主动物的寄生优势蜱种略有不同，其中，羊的染蜱率最高。农村外环境游离蜱密度明显高于景区生境。以上结果可为浙江省公共卫生机构制定针对性的防蜱灭蜱措施提供参考。

关键词: 蜱, 监测, 密度, 宿主动物