parasitic on mice of genus Peromyscus (especially P. leucopus) and bites humans; principal vector for Lyme disease in eastern United States (especially New England); northern form was for a time known as Ixodes dammini (deer tick).

• 寄生在老鼠身上的扁虱，咬人；美国东部（特别是新英格兰）地区莱姆关节炎螺旋菌主要的携菌体；北方的虱子一度被认为是硬蜱（鹿虱）。