Iowa Influenza Surveillance Network (IISN) Influenza like Illness (ILI ...

IowaInfluenzaSurveillanceNetwork(IISN) Influenza-likeIllness(ILI)andOtherRespiratoryViruses

WeeklyActivityReport FortheweekendingApril16,2022-MMWRWeek15

Alldatapresentedinthisreportareprovisionalandmaychangeasadditionalreportsarereceived

QuickStatsforWeek15

PredominantFluat SHL

N/A A(H3)

Lab Survey Flu Positive %

Antigen 8.2% Molecular 4.9%

Hospitalization Rateper10,000

108.35

Outpatient ILI %

1.74%

Cumulative Flu Deaths

AllAges

39

PredominantNonflu

Rhinovirus/Enterovirus PCR

21.6% +

Schools Reporting 10% Illness

3

WeeklySchool Illness %

2.9%

LongTerm Care Outbreaks

1

Cumulative Pediatric Flu Deaths

0

FluDeathNote:Deathsareconsideredinfluenza-associatedwheninfluenzaislistedonthedeathcertificate.Thisis anunderestimateofinfluenza-relateddeaths.Cumulativemortalitytotalsarefrom 10/3/21tothecurrentweek.

NOTE:Schooldataforweek52-53arelimitedduetoholidayclosings IowaStatewideActivitySummary

OverallInfluenzaActivity:Moderate

FlutestsatSHL:TheStateHygienicLaboratoryreported0influenzapositivespecimen(s)from specimens submitted.

AntigenTests:Therewere45of547(8.2%)influenzaantigentestsreportedaspositiveontheIowarespiratory virus survey.

MolecularTests:Therewere215of4,364(4.9%)influenzamoleculartestsreportedaspositiveontheIowa respiratory virus survey.

FluHospitalizations:17influenzarelatedhospitalizationswerereportedfrom sentinelsites.

OutpatientInfluenza-like-illness(ILI):TheproportionofoutpatientvisitsduetoILIwas1.74%,whichisabovethe regionalbaselineof1.7%. FluDeaths:1influenza-associateddeathwasreportedthisweek.

SchoolsReporting10% Illness:3schoolsreported10% ofstudentsabsentduetoillnessatleastoncethisweek.

Outbreaks:0long-term careinfluenzaoutbreakwasreportedthisweek.

Rhinovirus/EnterovirusPCRwasthemostfrequentlyreportednon-influenzaandnon-COVID19respiratorytesting targetreportedontheIowarespiratoryvirustestingsurveythisweekwith172of796testspositive(21.6%).

InternationalInfluenzaActivitySummary-WHO

DataSource:GlobalInfluenzaandResponseSystem (GISRS),FluNet(who.int/flunet).Visit



formoreinformation.

NationalInfluenzaLikeIllness(ILI)Activity-CDC

Thismapshowsinfluenza-likeillness,whichisdeterminedbysymptomssuchasfever,cough,andsorethroatthat canbecausedbyanumberofpathogensinadditiontoinfluenza(e.g.,COVID-19).Detailedinformationcanbefound onlineatflu/weekly/.

InfluenzaTestingattheStateHygienicLaboratoryattheUniversityofIowa(SHL)

CumulativeInfluenzaVirusesDetectedbySHLbyAgeGroup(10/3/2021-CurrentWeek)

Influenza A

Influenza B

Age Group

A(H1N1) pdm09

A(H3)subtAypneodtAVariant Total

B Victoria

B Yamagata

B not subtyped

0-4 5-17 18-24 25-49 50-64 65 + Total

0

18

0

0

18

0

0

0

0

29

0

0

29

0

0

0

0

50

1

0

51

0

0

0

0

13

0

0

13

0

0

0

0

12

0

0

12

0

0

0

0

22

0

0

22

0

0

0

0

144

1

0

145

0

0

0

Total

0 0 0 0 0 0 0

TableNote:Cellcountsofthreeorlessaresometimessuppressedtoprotectconfidentiality.Totalsbyagemaynot adduptototalsbysubtype/lineageduetomissingageinformation.OnlycasesofIowaresidentsareincluded. Specimenslistedas"notsubtyped"maybependingorwerenotabletobesubtypedduetoweakpositivelab results.Thiscanbeduetopoorcollection,timingofcollectionorstageofinfection.

InfluenzaVirusesDetectedbySHLbyWeek(10/3/21-CurrentWeek)

A(H1N1)pdm09 A(H3)

B Victoria

BYamagata

PositiveResults

20

15

10

5

0 Oct16,21

Dec11,21

Feb5,22

Apr2,22

May28,22

WeekEndingDate

Jul23,22 Sep17,22

GraphNote:Onlyvirusesthathavebeenassignedasubtypeorlineageareshown.

SHLFluTestingNote:TheStateHygienicLaboratory(SHL)istheprimarylaboratoryinIowacharacterizing specimensforinfluenzasurveillance.SHLreportsthenumberoftestsperformedandthetypeandsubtype/lineage ofpositiveteststotheinfluenzasurveillancenetworkdaily.SHLalsosendsaportionofspecimenstoCDCfor further characterization.

PositivePercentbyFluType

NumberofInfluenzaMolecularTestsandPositivePercentage

15K

Flu A

Flu B

50.0%

NumberTestsbyGroup

10K 5K

Lab Survey Flu Positive %

Molecular 4.9%

40.0% 30.0% 20.0% 10.0%

0K

0.0%

Oct16,21 Dec11,21 Feb5,22

Apr2,22 End Date

May28,22

Jul23,22 Sep17,22

PercentPositive

NumberTestsbyGroup

NumberofInfluenzaAntigenTestsandPositivePercentage

Flu A Ag

Flu B Ag

2K

40%

Lab Survey Flu Positive %

1K

20%

Antigen 8.2%

0K Oct16,21 Dec11,21

Feb5,22

Apr2,22 End Date

May28,22

0% Jul23,22 Sep17,22

IowaRespiratorySurvey-Influenza

FluTestsandPositivitybyRegion-CurrentWeek

Flu Region

1-C 2-NE 3-NW 4-SW 5-SE 6-E Total

Flu A

Antigen

Flu B

Number Positive Number Positive PositivesPercentby.. Positives Percentby..

14

9.2%

0

1

2.1%

0

12

4.7%

12

13.6%

39

7.1%

2

1.3%

0

2

4.2%

0

1

0.4%

1

1.1%

6

1.1%

Flu A

Molecular

Flu B

Number Positive Number Positive PositivesPercentby.. PositivesPercentby..

25 15

4 5 0 165 214

2.6% 9.6% 1.5% 8.5%

5.7% 4.9%

0

0.0%

1

0.6%

0

0.0%

0

0.0%

0

0

0.0%

1

0.0%

TableNote:Onlytestswithatleastonepositivethisweekareshown.

RespiratorySurveyNote:IDPHandSHLrunaweeklyweb-basedsurveyprogram wherelaboratoriansreportthe numberofinfluenzaandrespiratorysyncytialvirus(RSV)rapidtestsperformedandthenumberoftestspositive. Facilitiesreportedthetotalnumberoftestsandpositiveresults,notindividual-levelinformation.

OutpatientHealthCareProviderSurveillanceProgram (ILINet)

PercentOfOutpatientVisitsAttributedtoInfluenza-likeIllness(ILI)asReportedbyILINetSites

2017-18

2018-19

2019-20

2020-21

2021-22

ILIbySeason

10.0%

ILIPctCurrentSeason

5.0%

WeekEnding:4/16/2022 ILI% 1.7%

0.0% 41 44 47 50 1 4 7 10 13 16 19 22 25 28 31 34 37

ILIRecentWeeks

MMWR Week

13 14 15

End Date 4/2/2022 4/9/2022 4/16/2022

Age 0-4 15 21 11

Age 5-24 34 39 41

Age 25-49 13 15 12

Age 50-64

Age 65 and older

5

12

2

1

3

4

TotalILI 79 78 71

ILIPct 1.93% 1.78% 1.74%

OutpatientILINote:OutpatienthealthcareproviderswhoparticipateintheILINet(anationalinfluenzasurveillanceprogram)report thenumberofpatientsseenwithinfluenza-likeillnessandthetotalnumberofpatientvisitseachweek.Iowahealthcareproviders interestedinjoiningthissurveillanceprogram shouldcontactAndyWeigelat515-322-1937orandy.weigel@idph.formore information.TheILIDefinitionhaschangedfor20121-22sothatpersonswithILIsymptoms(cough,sorethroat,fever)willbecounted evenifpositiveforotherresperitoryillness(e.g.,COVID-19)whichmakescomparisonacrossseasonsdiffi cult.

IowaDepartmentofPublicHealthDataTrackingPortal-FluVaccine

VisittheIowaPublicHealthTrackingPortalInfluenzaVaccineDatapagefordetailsonIowaFluVaccineCoverage:

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