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  2. 3 hours ago · Rocky Mountain Spotted Fever (RMSF): Caused by the bacterium Rickettsia rickettsii, Rocky Mountain spotted fever is transmitted by the American dog tick (Dermacentor variabilis) or the brown dog tick (Rhipicephalus sanguineus). Symptoms may include fever, lethargy, anorexia, joint pain, and skin rash.

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