Ecologic factors and tick-borne relapsing fever in the western United States : county and zip code analyses
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Tick-borne relapsing fever (TBRF) is a rare bacterial disease caused primarily by Borrelia hermsii and Borrelia turicatae in the western United States and transmitted by Ornithodoros species soft ticks. No spatial analyses have been attempted for TBRF, and previous epidemiologic studies were limited to case series and outbreak investigations. This study employed ArcGIS to map counties and zip codes with identified cases of TBRF and neighboring control counties and zip codes. A total of 140 counties with reported cases of TBRF, identified in a previous publication, and 243 counties with no reported ...