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1、NovelH1N1InfluenzaUpdateAugust2009WhatdidwelearnfromtheSpring2000H1N1experience?HowwilltheFallfluseasondifferfromSpring2009experience?FrankJ.Welch,MDMSPHMedicalDirector,PandemicPreparednessDepartmentofHealthandHospitals,OfficeofPublicHealthLouisianaResponse:Apr
2、il-May2009H1N1OutbreakWeek1-3:AggressiveApproachbasedoninitialinformationfromMexicoexperience:EmergingUnknownInfection!Week4on:ParadigmShift!–mild/moderateinfluenzastrain.FocusonseriouscasesNationalResponse:PandemicDeclaredH1N1viruscontinuestospreadJune11,2009:
3、WHOdeclaresaglobalpandemicofnovelinfluenzaA(H1N1)byraisingtheworldwidepandemicalerttophase6“Pandemic”isareflectionofthespreadoftheH1N1virus,nottheseverityofillnessH1N1TransmissionCharacteristicsWiderangeofsymptoms:fever,cough,sorethroat,bodyaches,headache,chill
4、s,andfatigueManyreportsofnausea,vomiting,diarrheaU.S.hashigherthannormalInfluenzaLikeIllnessLocalizedandsomeintenseoutbreaksstilloccurringMostpeoplerecoverwithoutmedicalinterventionExpectedtocontinuethroughsummerandintofallPotential,alongwithseasonalinfluenza,t
5、ocausesignificantillnessandhospitalizationsinthenextfluseasonInternationalUpdate2009H1N1continuestocirculateintropicalcountries.ContinuingtoincreaseinsouthernAfricawithmoreAfricacountrieshavereportedtheirfirstcases.2009H1N1isthepredominantinfluenzavirusincircul
6、ationworldwide.Epidemiologyofthediseasecausedbythe2009H1N1influenzavirusintheSouthernHemisphereisverysimilartothatdescribedintheUnitedStatesthispastspring.NosignificantchangesdetectedinthevirusisolatedintheSouthernHemisphereascomparedtovirusesisolatedintheNorth
7、ernHemisphere.H1N1intheUnitedStatesMoststatesendcaseidentificationinMayHospitalizationsanddeathsarestillbeingcountedU.S.hospitalizations7983U.S.deaths522HigherlevelsofinfluenzaactivitythanisnormalforthistimeofyearCurrentvisitstodoctorsforinfluenza-likeillnessar
8、edownfromApril,buthigherthanwhatisexpectedinthesummerAll50stateswithoutbreaksoccurringSignificantlyhigherlevelsofflu-likeillnessthanisnormalforthistimeofyearAnticipateNovelH
