Volume 27, Number 12—December 2021
Research Letter

Borrelia miyamotoi in Human-Biting Ticks, United States, 2013–2019

Guang XuComments to Author , Chu-Yuan Luo, Fumiko Ribbe, Patrick Pearson, Michel Ledizet, and Stephen M. Rich
Author affiliations: University of Massachusetts–Amherst, Amherst, Massachusetts USA (G. Xu, C.-Y. Luo, F. Ribbe, P. Pearson, S.M. Rich); L2 Diagnostics, New Haven, Connecticut, USA (M. Ledizet)


During 2013–2019, Borrelia miyamotoi infection was detected in 19 US states. Infection rate was 0.5%–3.2%; of B. miyamotoi–positive ticks, 59.09% had concurrent infections. B. miyamotoi is homogeneous with 1 genotype from Ixodes scapularis ticks in northeastern and midwestern states and 1 from I. pacificus in western states.

And yes, Wisconsin is one of them. 

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