Rocky Mountain Spotted FeverRickettsia rickettsiiIncidenceOklahomaRhipicephalus sanguineusUnited States Indian Health ServiceTicksDisease NotificationCenters for Disease Control and Prevention (U.S.)Indians, North AmericanUnited StatesRisk FactorsRetrospective StudiesProspective StudiesCohort StudiesTime FactorsAge DistributionFollow-Up StudiesRegistriesInfant, NewbornTreatment OutcomeSex DistributionPrevalencePopulation SurveillanceNeoplasmsPostoperative ComplicationsRisk AssessmentJapanPoisson DistributionSeasonsPregnancyRiskSurvival RateSweden