Weekly Influenza & Respiratory Illness Activity Report

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Weekly Influenza & Respiratory Illness ActivityReportWeek Ending February 6, 2021 WEEK 5A summary of influenza surveillance indicators prepared by the Division of Infectious Disease Epidemiology Prevention & Control.All data are preliminary and may change as more information is received.ContentsMinnesota Influenza Key StatisticsPercent of molecular laboratory tests positive0.1%Hospitalizations32Most common strainInfluenza BSchool outbreaks3Long-term care outbreaks3Pediatric influenza-associated deaths0Hospitalized Influenza Surveillance.2Influenza-Associated Death Surveillance.4Respiratory Disease Outbreak Surveillance: School Outbreaks.5Respiratory Disease Outbreak Surveillance: LTC Outbreaks.6Sentinel Provider Surveillance (Outpatients).7Laboratory Surveillance .8Minnesota Influenza Incidence Surveillance Project (MIISP) .10Weekly U.S. Influenza Surveillance Report.12Minnesota Influenza Surveillance (www.health.state.mn.us/diseases/flu/stats/)Weekly U.S. Influenza Surveillance Report (www.cdc.gov/flu/weekly/)World Health Organization (WHO) Surveillance (www.who.int/influenza/surveillance monitoring/updates/en/)Neighboring states’ influenza information:Iowa: Iowa Flu Reports (idph.iowa.gov/influenza/reports)Wisconsin: Influenza (Flu) th Dakota: Reported Seasonal Influenza Activity in North Dakota (www.ndflu.com/default.aspx)South Dakota: South Dakota Influenza Information (doh.sd.gov/diseases/infectious/flu/)Minnesota Department of Health651-201-5414 or 1-877-676-5414www.health.state.mn.usDue to the COVID-19 pandemic, CDC and MDH will notbe posting the weekly geographic spread indicators (noactivity, sporadic, local, regional, widespread) this seasonas they rely on influenza-like illness data (ILI). Becausethese data are based on symptoms, the cause of ILIcannot reliably be attributed to influenza while COVID-19is widely circulating.

WeekB (no genotype)B (Yamagata)B (Victoria)A (not subtyped)A H34041142A H1 (unspecified)A (H1N1)pdm09A (H1N2v)A 4421371423362022432222Hospitalized Influenza Surveillance1Hospitalized influenza cases are based on disease reports of laboratory-positive influenza (via DFA, IFA, viral culture, EIA, rapid test, paired serological testsor RT-PCR) and specimens from hospitalized patients with acute respiratory illness submitted to MDH-PHL by hospitals and laboratories. Due to the need toconfirm reports and reporting delays, consider current week data preliminary.43144145114621473481491Hospitalized Influenza Cases by Type,Minnesota (FluSurv-NET*)505051152345678Number of Hospitalizations2214013541B (Yamagata)8B (Victoria)9A (not subtyped)1531453A H3A H1 (unspecified)10A (H1N1)pdm0911A (H1N2v)20A&B2Unknown25481622021315263Current week19110113298910118A (H3N2v)3035510541054141 43 45 47 49 51 532468 10 12 14 16 18 20MMWR 0263248166260377251140264106106Hospitalizations last weekTotal hospitalizations (to date)05324898191Current week40 42 44 46 48 50 52 ions this 91830119591517710559014431051213Number of HospitalizationsB (no genotype)Hospitalized Influenza Cases by Season,Minnesota 82018-20192019-20202020-2021323419357MMWR 3513455624228019282911032 (to date)2020-219 11 13 15 17 19189Total hospitalizations (historic)2015-16*FluSurv-NET Influenza Surveillance Network19Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending February 6, 2021 WEEK 520Page 2

Hospitalized Influenza Surveillance (continued)Number of Influenza Hospitalizations and Incidence by Region,MinnesotaSeptember 27, 2020 – February 6, 2021# of hospitalizations300.5818252.511510West 00.50.00.0South CentralSouthwest0.78RegionHospitalizations thisweekTotal(to date)Central0 (0%)4 (13%)Metro4 (100%)18 (56%)Northeast0 (0%)1 (3%)Northwest0 (0%)0 (0%)South Central0 (0%)4 (13%)Southeast0 (0%)4 (13%)Southwest0 (0%)1 (3%)West Central0 (0%)0 (0%)West theast1NorthwestSouth dence (cases) per100,000 PersonsCentralNumber of HospitalizationsMetro4.0# of hospitalizations45Incidence (cases) per 100,000 PersonsAge40# of hospitalizationsIncidence (cases) per100,000 5-2465 Case Total2520324.03.01.90.572.015100.05.0# of Age Group (years)65 0.0Median age (years) at time of admission66.5Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending February 6, 2021 WEEK 5Page 3Hospitalizations per 100,000 Persons40RegionCentralIncidence (cases) per 100,000 PersonsHospitalizations per 100,000 Persons45September 27, 2020 – February 6, 2021505.0Number of Hospitalizations50Number of Influenza Hospitalizations and Incidence by Age,Minnesota

10470480Influenza-Associated Death SurveillanceInfluenza deaths are collected via reports from Minnesota’s death certificate database, hospitals, and long-term care facilities. Decedents with influenza listedas a cause of or contributor to death, have recent laboratory confirmation of influenza, or are part of an ongoing influenza outbreak at a long-term care facilityare reported to influenza surveillance. Due to the need to confirm reports and reporting delays, consider current week data preliminary.4952403456Number of Current week40 42 44 46 48 50 521314035120Deaths Associated with Influenza by Age Group and WR Week of 0256010133511201812813653315010011 13 15 17 1900-1718-4950-64Age Group (years)65-79Total deaths (historic)Total pediatric ( 18 years) deaths (historic)SeasonMedian age (years) at time of 752019-2020732020-202186 (to date)273440951535 (to date)30*FluSurv-NET Influenza Surveillance Network26130 (to date)2020-212015-165015530050-6480 2502Number of Deaths455112015-165050Deaths Associated with Influenza by Season,MinnesotaMinnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending February 6, 2021 WEEK 580 Page 4

726213153150141641201551641Respiratory Disease Outbreak Surveillance: School OutbreaksNumber of Influenza-like Illness OutbreaksK-12 schools report an outbreak of influenza-like illness (ILI) when the number of students absent with ILI reaches 5% of total enrollment or three or morestudents with ILI are absent from the same elementary classroom.5253123456789150100500Influenza-like Illness (ILI) in Schools by -21Current week40 41 42 43 44 45 46 47 48 49 50 51 52 5381004820170050182160191360200040† The Week 53 value for these seasons is the average of Week 52 and Week 112345678910 11 12 13 14 15 16 17 18 19 20MMWR WeekNew school outbreaks this weekNew school outbreaks last weekTotal this season (to date)003Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending February 6, 2021 WEEK 5Page 5

0-21000000000000000Respiratory Disease Outbreak Surveillance: LTC OutbreaksLong-Term Care (LTC) facilities report to MDH when they suspect an outbreak of influenza in their facility. Laboratory-confirmed outbreaks are reported 1Number of lab-confirmed 111050Confirmed Influenza Outbreaks in LTC by Season01702011020331203321† The Week 53 value for these seasons is the average of Week 52 and Week 122017-18†2018-19†2019-20†2020-21Current week40 41 42 43 44 45 46 47 48 49 50 51 52 53122016-17†0112345678910 11 12 13 14 15 16 17 18 19 20MMWR WeekNew LTC outbreacksI this weekNew LTCoutbreaks last weekTotal this season (to date)013Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending February 6, 2021 WEEK 5Page 6

12020-21 MN el Provider Surveillance (Outpatients)MDH collaborates with healthcare providers who report the total number of patients seen and the total number of those patients presenting to outpatientclinics with influenza-like illness.Percentage of Persons Presenting to Outpatient Clinics with Influenza-Like Illness 234567*15‡161718191.93Percent with Influenza-like Illness513.183.24.254.34.15.2412108642040 41 42 43 44 45 46 47 48 49 50 51 52 -18†2018-19†2019-20†2020-212020-21 MN Baseline‡Current 81.681.892845678910 11 12 13 14 15 16 17 18 19 20MMWR WeekIndicates current week-data may be delayed by 1 or more weeks† The Week 53 value for these seasons is the average of Week 52 and Week 1MN Baseline valid for 2020-21 season only, do not compare it with previous seasons. The baseline iscalculated by averaging the ILI percent for non-influenza weeks over the previous four seasons andadding two standard deviations. Non-influenza weeks account for less than 2% of the season’s totalflu-positive specimens tested at Public Health Labs in HHS Region 5. Weeks where ILI % is abovebaseline reflect weeks with excess health care visits due to ILI.3.53% of outpatients with ILI this week% of outpatients with ILI last week0.5%0.3%2.8Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending February 6, 2021 WEEK 5202.81.42.315662.8Page 7

WeekA (H1N1) pdm09A H3A (not subtyped)B2016-17 % by PCR2017-18 % by PCR2018-19 % by PCR2019-20 % by PCR2020-21 % by 570.64350012.110.632.00222Laboratory SurveillanceThe MN Lab System (MLS) Laboratory Influenza Surveillance Program is made up of more than 310 clinic- and hospital-based laboratories, voluntarilysubmitting testing data weekly. These laboratories perform rapid testing for influenza and Respiratory Syncytial Virus (RSV). Significantly fewer labs performPCR testing for influenza and three also perform PCR testing for other respiratory viruses. MDH-PHL provides further characterization of submitted influenzaisolates to determine the hemagglutinin serotype to indicate vaccine coverage. Tracking the laboratory results assists healthcare providers with patientdiagnosis of influenza-like illness and provides an indicator of the progression of the influenza season as well as prevalence of disease in the community.30500510011520025300BSpecimens Positive for Influenza by Molecular Testing*, by Week2017-18 % by 1.0507991011141516*175.80000