1.puutiaislaji (Ixodes scapularis), joka loisii hiirissä, puree ihmisiä ja toimii borrelioosin levittäjänä
1.a northeastern tick now recognized as same species as Ixodes scapularis
2.parasitic on mice of genus Peromyscus 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)