a malarialike protozoan naturally parasitizing certain rodents (Peromyscus and Microtus spp.) in North America; human cases have been reported in the U.S. The local tick vector is Ixodes scapularis, the numbers and infection levels of which have greatly increased in recent years with the increase in the deer population, which serves as an abundant blood source for I. scapularis.
See Also: Borrelia burgdorferi
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