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©2013 UpToDate ® Print Email Rocky Mountain spotted fever. Number of reported cases, by county - United States, 2007 Rocky Mountain spotted fever, caused by Rickettsia rickettsii , is reported throughout much of the United States, reflecting the widespread ranges of the primary tick vectors responsible for transmission (primarily Dermacentor variabilis in the East and Dermacentor andersonii in the West, but also Rhipicephalus sanguineus in some newly recognized focal areas). Centers for Disease Control and Prevention. Summary of notifiable diseases -- United States, 2007. MMWR Morb Mortal Wkly Rep 2009; 56:1.