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Ticks that transmit Lyme disease reported in nearly half of all US counties

Lyme disease is transmitted by the blacklegged tick (Ixodes scapularis) and the western blacklegged tick (Ixodes pacificus), and the range of these ticks is spreading, according to research published in the Journal of Medical Entomology.

Blacklegged Tick
This is a blacklegged tick (Ixodes scapularis), one of the main vectors of Lyme disease.
Credit: Gary Alpert, Harvard University, Bugwood.org.