Variation among geographically separated populations of Dermacentor andersoni (Acari: Ixodidae) in midgut susceptibility to Anaplasma marginale (Rickettsiales: Anaplasmataceae).

Abstract excerpt

Anaplasma marginale is a tick-borne rickettsial pathogen of cattle that is endemic throughout large areas of the United States. Cattle that survive acute infection become life-long persistently infected carriers. In the intermountain west the Rocky Mountain wood tick, Dermacentor andersoni Stiles, is the most common vector of A. marginale. Male D. andersoni acquire A. marginale when feeding on persistently...

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