Human Babesiosis on Nantucket Island, USA: Description of the Vector, Ixodes (Ixodes) Dammini, N. Sp. (Acarina: Ixodidae)1

Abstract
The Ixodes vector of human babesiosis in the northeastern United States represents a new species. All active stages of this tick, designated Ixodes dammini , n. sp., are described and compared with I. scapularis Say and I. muris Bishopp & Smith. In the Nantucket babesiosis focus, adult I. dammini most commonly feed on deer; larvae and nymphs are numerous on mice. Throughout the recorded species range (coastal areas in New Jersey, New York, Connecticut, Rhode Island, and Massachusetts; as well as Wisconsin and Ontario), each active stage feeds on a variety of vertebrates.

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