CoxiellaCoxiella burnetiiQ FeverRisk FactorsGoat DiseasesAntibodies, BacterialGoatsPrevalenceSheep DiseasesSeroepidemiologic StudiesEndocarditis, BacterialComplement Fixation TestsCase-Control StudiesCardiovascular DiseasesZoonosesRickettsiaRickettsia typhiAbortion, VeterinaryIncidenceDNA, BacterialRickettsia rickettsiiBlotting, SouthwesternProspective StudiesLogistic ModelsCohort StudiesSmokingAge FactorsRetrospective StudiesVacuolesMultivariate AnalysisOdds RatioCross-Sectional StudiesRisk AssessmentPolymerase Chain ReactionHeart ValvesDairying