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American dog tick, male

A male American dog tick, Dermacentor variabilis, on a human finger (dorsal view). Photograph by Jerry Kirkhart, Los Osos, California (2009). (Courtesy of Wikimedia Commons. Creative Commons Attribution 2.0 International [CC BY 2.0] license, creativecommons.org/licenses/by/2.0.)

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  • Acute ascending paralysis