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Dermacentor variabilis, 400X w.m.
Dermacentor variabilis, also known as the American dog tick or Wood tick, is a species of tick that is known to carry bacteria responsible for several diseases in humans, including Rocky Mountain spotted fever andtularemia (Francisella tularensis). It is one of the most well-known hard ticks. Diseases are spread when it sucks blood from the host, which could take several days for the host to experience some symptoms. Though D. variabilis may be exposed to Borrelia burgdorferi, the causative agent of Lyme disease, these ticks are not competent vectors for the transmission of this disease. The primary vectors for Borrelia burgdorferi are the deer tick Ixodes scapularis in Eastern parts of the United States, Ixodes pacificus in California and Oregon, and Ixodes ricinus in Europe . Dermacentor variabilis may also carry Anaplasma phagocytophilum, the causative agent of HGE (human granulocytic ehrlichiosis), and Ehrlichia chaffeensis, the causative agent of HME (human monocytic ehrlichiosis).