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Tick-borne infectious diseases in the United States. Lyme diseaseEhrlichioses Rocky Mountain spotted feverBabesiosesColorado tick feverTularemiaTick-borne relapsing fever. RMSF: background. The most severe rickettsial illness of humans, caused by Rickettsia rickettsii First specific notation of the disease in 1896Endemic to the AmericasUntil recently, 300-800 U.S. cases/year.
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