TexasSoutheastern United StatesHispanic AmericansSouthwestern United StatesMexicoPopulation SurveillanceMexican AmericansDisease OutbreaksPrevalenceEuropean Continental Ancestry GroupIncidenceRisk FactorsEthnic GroupsMidwestern United StatesAfrican AmericansNorthwestern United StatesEmigration and ImmigrationContinental Population GroupsAge FactorsNew MexicoInfant, NewbornSocioeconomic FactorsCenters for Disease Control and Prevention (U.S.)United States Food and Drug AdministrationAge DistributionRetrospective StudiesData CollectionCanadaUnited States Department of AgricultureSex FactorsTravelCross-Sectional StudiesHealth SurveysFloridaWest Nile FeverAcculturationTime FactorsAfrican Continental Ancestry GroupSeasonsHistory, 20th Century