Map of the United States showing West Nile Virus Activity by State in 2020. See. *WNV human disease cases or presumptive viremic blood donors. Presumptive ...SkipdirectlytositecontentSkipdirectlytopageoptionsSkipdirectlytoA-ZlinkWestNilevirusSectionNavigationCDCHomeFacebookTwitterLinkedInSyndicateWestNileVirusActivitybyState2020MinusRelatedPagesWestNileVirusActivitybyState–UnitedStates,2020(asofMay25,2021)*WNVhumandiseasecasesorpresumptiveviremicblooddonors.Presumptiveviremicblooddonorshaveapositivescreeningtestwhichhasnotnecessarilybeenconfirmed.†WNVveterinarydiseasecases,orinfectionsinmosquitoes,birds,orsentinelanimals.Datatable:WNVinfectionsinmosquitoes,birds,sentinelanimals,orveterinaryanimalshavebeenreportedtoCDCArboNETfromthefollowingstatesfor2020:Alabama,Arizona,Arkansas,California,Colorado,Connecticut,Delaware,Florida,Georgia,Idaho,Illinois,Indiana,Iowa,Kansas,Kentucky,Louisiana,Massachusetts,Maryland,Michigan,Mississippi,Missouri, Montana,Nebraska,Nevada,NewHampshire,NewJersey,NewYork,NorthCarolina,Ohio,Oklahoma,Oregon,Pennsylvania,SouthCarolina,Tennessee,Texas,Utah,Virginia,Washington,andWyoming.WestNilevirusinfectionsinhumanshavebeenreportedtoCDCArboNETfromthefollowingstates:AlabamaArizona,California,Colorado,Connecticut,Florida,Georgia,Idaho,Illinois,Indiana,Iowa,Kansas,Louisiana,Maine,Maryland,Massachusetts,Michigan,Mississippi,Missouri,Montana,Nebraska,Nevada,NewJersey,NewMexico,NewYork,NorthCarolina,NorthDakota,Ohio,Oklahoma,Oregon,Pennsylvania,SouthCarolina,SouthDakota,Texas,Utah,Virginia,Washington,Wisconsin,andWyoming.Pagelastreviewed:May25,2021Contentsource:CentersforDiseaseControlandPrevention,NationalCenterforEmergingandZoonoticInfectiousDiseases(NCEZID),DivisionofVector-BorneDiseases(DVBD)homeWestNileVirusHomePreventionSymptoms,Diagnosis,&TreatmentTransmissionplusiconBloodTransfusionandOrganDonationMothertoBabyduringPregnancy,Delivery,orBreastFeedingStatistics&MapsplusiconPreliminaryMaps&Datafor2021plusiconDiseaseCasesbyStateActivitybyStateInci