Tell Us What You Think Ottawa Ounty Influenza Surveillance .

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Tell us what you thinkOttawa County Influenza Surveillance ReportMMWR* Week 17: April 19, 2020 - April 25, 2020Scan code or click HERESummary:During week 17, influenza positivity in Ottawa County was 8.6%. No influenza-like illness (ILI) was reported inschools/licensed childcare settings. In-person activities in most schools/childcare settings are suspended as partof the measures to mitigate the spread of coronavirus disease (COVID-19). Reported ILI in healthcare offices(0.8%) increased slightly from last week, staying below this same time last year. No influenza was reported inlong-term care facilities (LTCF). Emergency Department (ED) visits with influenza symptoms decreased to 0.8%,slightly below this same time last year. Overall, influenza activity was moderate – low in week 17.Influenza Test PositivityInfluenza positivity is the percent of influenza tests conducted by reporting providers and laboratoriesthat result positive. In week 17, reported positivity was 8.6%. Elevated influenza laboratory positivity is often anindication that influenza is circulating in the community (1,2). Influenza positivity has been moderate over thelast 3 weeks.Positivity Rate of Influenza Tests by Week, Ottawa County and United States, 2019-20 SeasonMMWR* WeekWeek ending dateType AType BUnspecifiedTotal InfluenzaTotal 202004/25/202027626008332703833.0%8.6%Influenza test data includes both PCR and rapid tests* Morbidity and Mortality Weekly Report

Influenza-Like Illness (ILI) Surveillance from Reporting Schools,Childcare and Healthcare SettingsOttawa County Department of Public Health (OCDPH) reports on ILI activity in schools, licensed childcare,healthcare providers and LTCFs by week. During week 17, the proportion of ILI reported in school/childcarewas 0%. This is mainly due school closures across the county as a measure to mitigate the spread of coronavirus disease (COVID-19). ILI in healthcare offices (0.8%) was also low, staying below that reported at this timelast season (1.2%). There was one new report of influenza in a LTCF during week 17.School and Childcare ILI by WeekHealthcare ILI Visits by Week

Syndromic Surveillance for InfluenzaThis data reflects the proportion of patients seen in Ottawa County hospital EDs with an influenzasymptom*. During week 17, Ottawa County ED visits with influenza symptoms decreased to 0.8%(from 1.7% last week). This proportion is lower than that seen at the same time last season (1.1%). The decreasein ED census over the last few weeks might contribute to the overall decrease in reported ILI.Percentage of ED Visits in Ottawa County with Influenza SymptomsMMWR WeekWeek Ending DateTotal ED ILITotal ED VisitsPercent 25/202067750.8%* Influenza symptoms include sudden onsets of fever, cough and/or sore throat.Influenza Vaccine CoverageThe best way to prevent influenza is by getting the influenza vaccine each year. Although below thenational average, Ottawa County has seen improvements in influenza vaccine coverage over theyears. The table below reflects adult vaccination coverage in Ottawa County, Michigan and the United Statesover the last 5 influenza seasons.2014-15 Season 2015-16 Season 2016-17 Season2017-18 Season2018-19 SeasonOttawa 9%27.9%30.3%United States ealthy People 2020 TargetSource: Michigan’s County Quarterly Immunization Report Card - Annual Q2 Reports.

Influenza Vaccine Coverage by Season, Ottawa County, Michigan and United StatesInfluenza Vaccine EffectivenessThe performance of influenza seasonal vaccines are monitored to improve their benefits. Vaccineeffectiveness (VE) studies regularly assess and confirm the value of flu vaccination as a public healthintervention3. The table below shows estimates of seasonal flu vaccine effectiveness from past seasons.2015-16 Season 2016-17 Season 2017-18 Season 2018-19 SeasonOverall vaccine effectiveness48%40%38%29%2019-20 Season45%4Source: CDC - Past seasons Vaccine Effectiveness Estimates .Severe DiseaseOne new influenza-associated pediatric death was reported to the Centers for Disease Control andPrevention (CDC) on week 17, making a total of 170 influenza-associated pediatric deaths thisseason. Two influenza-associated pediatric deaths have been reported in Michigan so far this season. Therehave been no reports influenza-associated pediatric deaths in Ottawa County.

Resources Michigan Department of Health and Human Services - Influenza activity and Surveillance: https://www.michigan.gov/mdhhs/0,5885,7-339-71550 2955 22779 40563 48357-191722--,00.html Michigan’s County Quarterly Immunization Report Card: https://www.michigan.gov/documents/mdch/Ottawa 447497 7.pdf and https://www.michigan.gov/documents/mdch/Report Card Defs 447511 7.pdf National influenza surveillance data are available at: https://www.cdc.gov/flu/weekly/ Recommendations of the Advisory Committee on Immunization Practices, 2019–20 Influenza 03a1.htm?scid rr6803a1e&delivery Name USCDC 921DM7382 1 2 3 4Forecasting Peak Activity of Seasonal Influenza Using Only One Surveillance Indicator Colorado, 20132019 (CSTE Presentation): By Bernadette Albanese, MD, MPH, Tri-County Health DepartmentBaumbach, J., Mueller, M., Smelser, C., Albanese, B., & Sewell, C. M. (2009). Enhancement of influenzasurveillance with aggregate rapid influenza test results: New Mexico, 2003-2007. American journal ofpublic health, 99 Suppl 2(Suppl 2), S372–S377. doi:10.2105/AJPH.2007.125450CDC. (2019). Seasonal Flu Vaccine Effectiveness Studies. Available at -studies.htmCDC. (2019). Past Seasons Vaccine Effectiveness Estimates. Available at -estimates.htmlNOTE: This surveillance report is based on preliminary data. Charts and figures are subject to change as thedata is updated.Tell us what you think of this reportScan code or click HEREContact InformationDerel Glashower, MPH, CPHDerick N. Chia, MPHSenior EpidemiologistOttawa County Department of Public HealthPhone: 616-393-5785Email: dglashower@miottawa.orgEpidemiologistOttawa County Department of Public HealthPhone: 616-393-5765Email: dchia@miottawa.org

The table below shows estimates of seasonal flu vaccine effectiveness from past seasons. 2015-16 Season 2016-17 Season 2017-18 Season 2018-19 Season 2019-20 Season Overall vaccine effectiveness 48% 40% 38% 29% 45%. Source: CDC -Past seasons

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