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Medical Definition of Rhipicephalus sanguineus
1. The brown dog tick, probably the most common and cosmopolitan species found on dogs in the U.S.; it may attack other animals but rarely attacks humans; it is a vector of Rocky Mountain spotted fever in Mexico, the major vector of canine babesiosis, transmits canine ehrlichiosis, and is a vector of the rickettsia of boutonneuse fever. (05 Mar 2000)