West Nile virus (WNV) is a mosquito-borne virus that causes disease in humans, horses, and birds. WNV spreads to people through the bite of an infected ...PressReleases|Jul09,2021CDPHConfirmsFirstHumanWestNileVirusDeathof2021WestNilevirus(WNV)isamosquito-bornevirusthatcausesdiseaseinhumans,horses,andbirds.WNVspreadstopeoplethroughthebiteofaninfectedmosquito,anditcanmakepeoplesickandevencausedeath.WNViscommonintheUnitedStates,especiallyinCalifornia,andisaproblemthatisheretostay.ThebestwaytopreventWNVistoprotectyourselffrommosquitobites.MosquitoesoftengetWNVfrombirds.DeadbirdreportsareonewayoftrackingwhereWNVcouldbespreading.YoucanhelptheCaliforniaDepartmentofPublicHealth(CDPH)trackWNVinCaliforniabyreportingdeadbirds.ReportaDeadBirdLookupLocalVectorAgencyLocateyourlocalmosquitoandvectorcontrolagencyZipCodeSubmit2021WestNileVirusActivityinCaliforniaLastUpdated:Jul16,20215:34pmPST2HumanCases68DeadBirds283MosquitoSamples0SentinelChickens1HorsesWNVCAActivityMapViewdownloadableandprintablemapWeeklyUpdatesActivityisupdatedeveryFridayby5pmWNVCaseCountsbyCountyActivitybycountyWNVPreventionandInformationEducationalmaterialsDidyouknow?WestNilevirusisthemostcommonandseriousvector-bornediseaseinCalifornia.Therehavebeenmorethan7,000humancasesandover300deathsreportedinCaliforniasince2003.ThemosquitoesthatspreadWNVarefoundthroughoutthestate.WeeklyUpdatesHumanCasesYear-to-date:2Counties:2Therewas1newWNVpositivehumancasereportedinCalifornialastweekfromFresnoCounty.ThisisthefirstWNVpositivehumancasefromFresnoCountythisyear.1WNV-relatedfatalityhasbeenreportedtoCDPHthisyearfrom1jurisdiction:SanLuisObispo(1).2humancasesfrom2countieshavetestedpositiveforWNVin2021.DeadBirdsYear-to-date:68Counties:9Therewere23newWNVpositivedeadbirdsreportedinCalifornialastweekfromthefollowingcounties:LosAngeles(3),Merced(1),Placer(1),Sacramento(12),SanBernardino(1),SanJoaquin(4),andStanislaus(1).ThisisthefirstWNVpositivedeadbirdfromStanislausCountythisyear.ThisisthefirstindicationofWNVfromMercedandSanBernard