Weekly Influenza & Respiratory Illness Activity Report Week Ending November 21, 2020 | WEEK 47 A 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. Minnesota Influenza Key Statistics Contents Percent of molecular laboratory tests positive 0.1% Hospitalized Influenza Surveillance ............................................................................................................2 Influenza-Associated Death Surveillance ...................................................................................................4 Hospitalizations 12 Respiratory Disease Outbreak Surveillance: School Outbreaks .................................................................5 Most common strain Influenza B Respiratory Disease Outbreak Surveillance: LTC Outbreaks ......................................................................6 Sentinel Provider Surveillance (Outpatients) .............................................................................................7 School outbreaks 3 Laboratory Surveillance .............................................................................................................................8 Minnesota Influenza Incidence Surveillance Project (MIISP) ..................................................................10 Long-term care outbreaks 1 Weekly U.S. Influenza Surveillance Report ...............................................................................................12 Pediatric influenza-associated deaths 0 Minnesota 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/) Due to the COVID-19 pandemic, CDC and MDH will not Neighboring states’ influenza information: be posting the weekly geographic spread indicators (no activity, sporadic, local, regional, widespread) this season Iowa: Iowa Flu Reports (idph.iowa.gov/influenza/reports) as they rely on influenza-like illness data (ILI). Because Wisconsin: Influenza (Flu) (www.dhs.wisconsin.gov/communicable/influenza/) these data are based on symptoms, the cause of ILI North Dakota: Reported Seasonal Influenza Activity in North Dakota (www.ndflu.com/default.aspx) cannot reliably be attributed to influenza while COVID-19 South Dakota: South Dakota Influenza Information (doh.sd.gov/diseases/infectious/flu/) is widely circulating. Minnesota Department of Health 651-201-5414 or 1-877-676-5414 www.health.state.mn.us Week B (no genotype) B (Yamagata) B (Victoria) A (not subtyped) A H3 A H1 (unspecified) A (H1N1)pdm09 A (H1N2v) A (H3N2v) A&B Unknown Week 2015-16 2016-17 2017-18 2018-19 2019-20 2020-21 40 3 3 4 0 3 2 0 41 1 Hospitalized Influenza5 5 Surveillance1 4 4 5 1 42 1 1 1 2 6 11 6 1 43 1 3 3 4 10 8 8 1 Hospitalized influenza cases are based on disease reports of laboratory-positive influenza (via DFA, IFA, viral culture, EIA, rapid test, paired serological tests 4 4 4 7 5 7 1 or44 RT-PCR)1 and specimens from hospitalized patients with acute respiratory illness submitted to MDH-PHL by hospitals and laboratories. Due to the need to 4 4 2 13 7 14 2 confirm45 1 reports and reporting1 delays, consider current week data preliminary. 3 3 6 20 2 24 3 46 2 1 2 2 7 43 7 30 3 47 2 Hospitalized1 Influenza Cases by Type, Hospitalized Influenza Cases by Season, 2 2 10 54 10 54 48 Minnesota (FluSurv-NET*) Minnesota (FluSurv-NET*) 3 3 10 87 13 49 49 B (no genotype) 700 2015-16 50 8 8 14 123 9 67 B (Yamagata) 2016-17 50 650 B (Victoria) 9 9 25 246 18 115 2017-18 51 45 600 A (not subtyped) 11 11 61 557 51 197 2018-19 52 550 A H3 8 8 65 631 52 254 2019-20 500 1 40 A H1 (unspecified) 10 10 68 584 55 193 2020-21 450 2 A (H1N1)pdm09 11 11 123 664 51 213 35 400 3 A (H1N2v) 20 350 20 178 594 100 245 A (H3N2v) 4 30 32 300 32 222 479 139 236 A&B 5 48 250 48 260 430 132 372 Unknown 6 25 98 200 98 371 393 159 380 162 162 Current390 week 359 228 461 7 150 20 213 Number of Hospitalizations 100 213 265 242 197 430 8 263 50 263 248 166 260 377 Number of Hospitalizations 9 15 0 191 191 251 140 234 248 10 40 42 44 46 48 50 52 2 4 6 8 10 12 14 16 18 20 105 105 264 106 193 104 11 10 Current week MMWR Week 119 119 295 106 189 35 12 5 59 59 207 123 140 8 13 Season Total hospitalizations (historic) 59 59 152 91 92 5 14 0 2015-2016 1,538 37 37 83 53 51 3 15 40 42 44 46 48 50 52 2 4 6 8 10 12 14 16 18 20 2016-2017 3,695 19 19 45 45 56 2 16 2017-2018 6,446 MMWR Week 13 13 25 42 28 0 17 2018-2019 2,543 7 7 23 19 28 2 18 Hospitalizations this week Hospitalizations last week Total hospitalizations (to date) 2019-2020 4,022 6 6 10 9 11 0 3 3 12 2020-2021 12 (to date) 19 *FluSurv-NET = Influenza Surveillance Network 20 Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending November 21, 2020 | WEEK 47 Page 2 Hospitalized Influenza Surveillance (continued) Number of Influenza Hospitalizations and Incidence by Region, Number of Influenza Hospitalizations and Incidence by Age, Minnesota Minnesota September 27, 2020 – November 21, 2020 September 27, 2020 – November 21, 2020 50 5.0 50 5.0 # of hospitalizations # of hospitalizations 45 per Persons 100,000 Hospitalizations Incidence (cases) per 100,000 Persons 45 Incidence (cases) per 100,000 Persons Hospitalizations per per Persons 100,000 Hospitalizations 40 4.0 Age # of hospitalizations Incidence (cases) per 40 100,000 Persons 4.0 Region # of hospitalizations Incidence (cases) per 100,000 Persons 35 0-4 0 0.00 Central 2 0.26 35 5-24 1 0.07 Metro 306 0.19 3.0 25-49 301 0.06 3.0 Northeast 251 0.31 50-64 1 0.09 Northwest 0 0.00 25 20 2.0 65+ 9 1.01 South Central 1 0.63 15 Case Total 208 0.14 2.0 Southeast 1 0.20 Number of Hospitalizations Number of Hospitalizations 10 1.0 15 Southwest 1 0.46 0.6 0.5 1.0 0.3 0.2 0.3 West Central 50 0.00 0.2 10 1.0 0.0 0.0 Total 012 0.21 0.0 5 0.1 0.0 0.1 0.1 Metro Central 0 0.0 Southeast Northeast Southwest Northwest 0-4 5-24 25-49 50-64 65+ West Central Region South Central Age Group (years) Hospitalizations this Total Region Median age (years) at time of admission week (to date) 78 Central 0 (0%) 2 (17%) Metro 2 (67%) 6 (50%) Northeast 0 (0%) 1 (8%) Northwest 0 (0%) 0 (0%) South Central 1 (33%) 1 (8%) Southeast 0 (0%) 1 (8%) Southwest 0 (0%) 1 (8%) West Central 0 (0%) 0 (0%) Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending November 21, 2020 | WEEK 47 Page 3 Week 2015-16 2016-17 2017-18 2018-19 2019-20 2020-21 40 0 0 0 1 0 41 0 0 Influenza-Associated0 0 0 Death Surveillance 42 0 0 0 0 0 43 1 0 0 0 1 Influenza deaths are collected via reports from Minnesota’s death certificate database, hospitals, and long-term care facilities. Decedents with influenza listed 44 0 0 1 0 0 as 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 facility 45 1 0 2 0 0 are reported to influenza surveillance. Due to the need to confirm reports and reporting delays, consider current week data preliminary. 46 0 0 1 0 1 47 0 1 2 0 0 Deaths Associated with Influenza by Season, Deaths Associated with Influenza by Age Group and Season, 48 0 0 1 1 1 Minnesota Minnesota 49 0 2 2 1 1 2015-16 2015-16 2016-17 2017-18 2018-19 2019-20 2020-21 50 50 0 2 9 0 3 300 2016-17 Week 2015-16 2016-17 2017-18 2018-19 2019-20 2020-21 51 45 0 1 12 3 2 2017-18 0-17 3 2 6 1 3 52 1 1 12 2 3 18-49 250 10 10 10 9 15 40 2018-19 1 2 2 31 1 8 2019-20 50-64 18 20 37 16 31 2 35 1 2 49 1 10 2020-21 65-79 200 25 60 101 33 51 3 0 7 35 3 4 Deaths 30 80+ 20 181 281 36 53 4 0 6 48 3 5 25 Deaths 150 5 1 7 32 4 8 6 20 0 16 36 3 7 Number of 7 15 2 26 30 8 9 100 Number of 8 3 Current28 week 27 8 13 10 9 3 21 25 2 21 50 10 5 10 22 12 13 16 11 0 7 28 16 10 15 0 12 4014 42 44 4624 48 50 527 2 4 12 6 8 10 11 12 14 16 18 20 0-17 18-49 50-64 65-79 80+ 13 6 13 MMWR11 Week3 of Death 5 Age Group (years) 14 7 19 10 6 4 Season Total deaths (historic) Total pediatric (<18 years) deaths (historic) Season Median age (years) at time of death 15 4 16 9 4 3 2015-2016 76 3 2015-2016 68 16 6 12 5 2 0 2016-2017 273 2 2016-2017 86 17 5 6 4 1 0 2017-2018 440 6 2017-2018 85 18 0 4 2 2 1 2018-2019 95 1 2018-2019 75 19 1 4 2 1 1 2019-2020 153 3 2019-2020 73 20 0 0 2 0 0 2020-2021 1 0 (to date)3 0 0 (to date) 2020-2021 - (to date) *FluSurv-NET = Influenza Surveillance Network Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending November 21, 2020 | WEEK 47 Page 4 Week 2016-17† 2017-18† 2018-19† 2019-20† 2020-21 40 1 0 1 1 0 41 Respiratory1 2 1 3 Disease0 Outbreak Surveillance: School Outbreaks 42 0 1 0 1 1 43 1 0 0 4 0 K-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 more 44 1 2 2 0 0 students with ILI are absent from the same elementary classroom.