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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