35 36 37 38 39 4 41 42 43 44 45 46 47 48 49 5 51 52 **53 1 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16 17 18 19 2 21 22 23 24 25 26 27 28 29 3 31 32 33 34 Percent of Total Visits ESSENCE ILI Surveillance Week Ending 5/2/218 Week 2 As determined by ESSENCE, influenza-like illness (ILI) accounted for.% to.41% of daily visits to Saint Louis County hospital emergency departments (EDs) during the week ending 5/2/218. The number of daily visits to Saint Louis County hospital EDs for ILI ranged from to 6 during the same period. Note: Due to slight changes in the definition of ILI in the newest version of ESSENCE, data have changed slightly from reports posted prior to 3/18/218. 5 ILI as Weekly Percent of Total Emergency Department (ED) Visits Saint Louis County Hospital EDs 217-218 compared to previous 4 seasons 4.5 4 3.5 3 *High 2.5 2 1.5 1.5 Please remember the following points when interpreting ESSENCE data: CDC Week of Visit 13-14 14-15 15-16 16-17 17-18 *High: Average (mean) weekly ILI percent of visits from previous four seasons plus three (3) standard deviations. **For previous seasons with a week 53, the week 53 data point for these seasons is an average of week 52 and week 1.. ILI as a percentage of weekly visits in Saint Louis County hospital EDs was.22%, compared to.35% in 217 and.42% in 216, for week 2. Note: Due to slight changes in the definition of ILI in the newest version of ESSENCE, data have changed slightly from reports posted prior to 3/18/218. In the Week 2 Report, new ESSENCE definitions were used only for the 217-218 season. ILI counts are among St. Louis County residents visiting hospitals participating in ESSENCE only. Percent of visits attributed to ILI is from all hospital emergency departments in St. Louis County only. ESSENCE does not include data from private physicians, clinics, or ambulatory care centers. ESSENCE is based on chief complaints, not final diagnoses or laboratory confirmed tests. ILI includes chief complaints with the character strings like FLU, INFLUENZA, and FLULIKE and those that ESSENCE parses to (Fever and (Cough or Sore Throat).
Active Influenza Surveillance, Laboratory Confirmed Tests Week Ending 5/2/218 Week 2 Surveillance sites reported 1 case of influenza A and 1 case of influenza B for the week ending 5/2/218. Influenza A accounted for 5.% (vs. 5.% for influenza B) of total influenza cases for the week ending 5/2/218. For the week ending 5/13/218, 33.3% of total flu cases were caused by influenza A. To date, influenza A accounted for 67.8% of total influenza cases since the start of the 217-218 influenza season. Influenza by Report Week, Type Saint Louis County Residents Only For cases reported between 9/25/217 and 5/2/218 Week ending Type A Type B Unk Type Total 1/1/217 21 21 1/8/217 5 1 6 1/15/217 2 2 1/22/217 4 4 1/29/217 12 12 11/5/217 15 2 17 11/12/217 19 7 26 11/19/217 3 6 36 11/26/217 55 7 62 12/3/217 96 5 11 12/1/217 172 14 186 12/17/217 397 55 452 12/24/217 826 77 93 12/31/217 116 144 134 1/7/218 111 172 1282 1/14/218 891 183 174 1/21/218 61 268 869 1/28/218 42 331 733 2/4/218 31 358 659 2/11/218 224 341 565 2/18/218 163 438 61 2/25/218 19 257 366 3/4/218 75 145 22 3/11/218 47 15 152 3/18/218 47 18 155 3/25/218 37 63 1 4/1/218 18 59 77 4/8/218 1 46 56 4/15/218 11 27 38 4/22/218 6 26 32 4/29/218 8 12 2 5/6/218 2 11 13 5/13/218 3 6 9 5/2/218 1 1 2 Total 688 3275 1155 The has a wide range of provider sites enrolled in its active influenza surveillance program. Weekly, these sites report positive influenza findings to the Department of Public Health. As this is a sentinel surveillance program, the cases reported to DPH by these sites do not include all influenza cases diagnosed in Saint Louis County. Weekly totals may change as newly reported cases are attributed to the week of specimen collection. Page 2 of 8
Influenza by Age and Type Week Ending 5/2/218 Week 2 Saint Louis County Residents Only For cases reported between 9/25/217 and 5/2/218 Age Group Type A Type B Unk Type Total n (% of total) n (% of total) n (% of total) n (%) to <2 49 (4) 87 (1) () 496 (5) 2 to 4 628 (6) 228 (2) () 856 (8) 5 to 14 1214 (12) 66 (6) () 182 (18) 15 to 24 69 (7) 317 (3) () 17 (1) 25 to 49 1252 (12) 696 (7) () 1948 (19) 5 to 64 894 (9) 557 (5) () 1451 (14) 65+ 1792 (18) 784 (8) () 2576 (25) Total 6879 (68) 3275 (32) ()1154 (1) Page 3 of 8
Number of cases Number of cases Week Ending 5/2/218 Week 2 Total Influenza A by CDC Report Week, 217-218 compared to previous four seasons 14 12 Influenza A by Report Week Saint Louis County, MO 217-218 compared to previous 4 seasons 13-14: n = 1336 14-15: n = 2782 15-16: n = 1932 16-17: n = 3485 17-18 YTD: n = 688 1 8 6 4 2 35 36 37 38 39 4 41 42 43 44 45 46 47 48 49 5 51 5253* 1 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16 17 18 19 2 CDC Report week 13-14 14-15 15-16 16-17 17-18 *For previous seasons with a week 53, the week 53 data point for these seasons is an average of week 52 and week 1. Total Influenza B Cases by CDC Report Week, 217-218 compared to previous four seasons 5 45 4 Influenza B by Report Week Saint Louis County, MO 217-218 compared to previous 4 seasons 13-14: n = 59 14-15: n = 1117 15-16: n = 355 16-17: n = 2338 17-18 YTD: n = 3275 35 3 25 2 15 1 5 35 36 37 38 39 4 41 42 43 44 45 46 47 48 49 5 51 5253* 1 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16 17 18 19 2 CDC Report week 13-14 14-15 15-16 16-17 17-18 *For previous seasons with a week 53, the week 53 data point for these seasons is an average of week 52 and week 1. Page 4 of 8
Number of cases Week Ending 5/2/218 Week 2 Total Influenza A and B Cases by CDC Report Week, 217-218 compared to previous four seasons 14 12 Influenza A and B by Report Week Saint Louis County, MO 217-218 compared to previous 4 seasons 13-14: n = 2113 14-15: n = 3932 15-16: n = 2291 16-17: n = 5825 17-18 YTD: n = 1155 1 8 6 4 2 35 36 37 38 39 4 41 42 43 44 45 46 47 48 49 5 51 5253* 1 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16 17 18 19 2 CDC Report week 13-14 14-15 15-16 16-17 17-18 *For previous seasons with no week 53, the week 53 data point for these seasons is an average of week 52 and week 1. Page 5 of 8
Cases Case Rate per 1, Cases Case Rate per 1, Week Ending 5/2/218 Week 2 Influenza A Cases and Rates by Age Group 1 9 8 7 6 5 4 3 2 1 Influenza A Cases and Rates per 1, by Age Group 217-218 Season through 5/2/218, Saint Louis County, MO n = 688 2 18 16 14 12 1 8 6 4 2 Age Group Number of cases Case Rate Influenza B Cases and Rates by Age Group 35 3 25 2 15 1 5 Influenza B Cases and Rates per 1, by Age Group 217-218 Season through 5/2/218, Saint Louis County, MO n = 3275 8 7 6 5 4 3 2 1 Age Group Number of cases Case Rate Page 6 of 8
Number of cases Number of cases Influenza A Cases by Age 3 Week Ending 5/2/218 Week 2 Influenza A Cases by Age 217-218 Season through 5/2/218, Saint Louis County, MO n = 6879 Median = 33 yrs 25 2 15 1 5 4 8 12 16 2 24 28 32 36 4 44 48 52 56 6 64 68 72 76 8 84 88 92 96 1 14 Age (in years) Influenza B Cases by Age 1 9 8 7 6 5 4 3 2 1 Influenza B Cases by Age 217-218 Season through 5/2/218, Saint Louis County, MO n = 3275 Median = 41 years 4 8 12 16 2 24 28 32 36 4 44 48 52 56 6 64 68 72 76 8 84 88 92 96 1 14 Age (in years) Page 7 of 8
Week Ending 5/2/218 Week 2 Saint Louis County Influenza Outbreaks: As of the week ending 5/2/218, there have been four outbreaks of influenza reported to the Saint Louis County Department of Public Health. All outbreaks have occurred in long-term care facilities. Additionally, the Saint Louis County Department of Public Health has monitored numerous influenza clusters occurring in long-term care facilities throughout the flu season. Weekly Virus/Microbiology Update, St. Louis Children s Hospital*: http://slchlabtestguide.bjc.org/default.aspx?url=4ca7c749-6e2d-4cb7-94c7-151c984b2 *courtesy of Gregory Storch, MD, and the St. Louis Children s Hospital Clinical Laboratory For additional information on national influenza surveillance, please visit the Centers for Disease Control and Prevention website: https://www.cdc.gov/flu/weekly/ For additional information on statewide influenza surveillance, please visit the Missouri Department of Health and Senior Services website: http://health.mo.gov/living/healthcondiseases/communicable/influenza/reports.php Page 8 of 8