Current Week Quick Stats

INFLUENZA SURVEILLANCE UPDATE

ILLINOIS DEPARTMENT OF PUBLIC HEALTH Division of Infectious Disease

Week 1: Week Ending Saturday, January 4, 2020

All data in this report are provisional and may change as additional reports are received. Data are obtained from providers and health care facilities who voluntarily report influenza-like illness visit data from their facilities and submit clinical specimens for testing at IDPH laboratories. This is a sample which provides a picture of influenza

activity in Illinois and not inclusive of every case of influenza in Illinois. For questions, please contact the IDPH CD Section at 217-782-2016 or dph.influenza@ Additional reports on influenza in Chicago can be found on the City of Chicago Influenza Website

Current Week Quick Stats

Illinois Influenza Geographic Spread Percent of Outpatient Visits for ILI1, 4

Widespread 5.05% (baseline 1.9%)

Percent/Number of Influenza Positive Tests2 Influenza-Associated ICU Admissions3

Current Week: 14.1% (125/886); Season: 7.0% (737/10554)

Current Week: 56; Season: 199

Influenza Outbreaks Influenza-Associated Pediatric Deaths (Season Total)

Current Week: 4; Season: 15 1

Illinois Sentinel Influenza-Like Illness (ILI) Surveillance

7.00%

Influenza-Like Illness by Season, Illinois

Average, 2012-13 through 2019-20

2015-16

2016-17

2017-18

2018-19

2019-2020

6.00%

5.00%

Percent ILI

4.00%

3.00%

2.00%

1.00%

0.00% 40 41 42 43 44 45 46 47 48 49 50 51 52 53 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

MMWR Week

1 ILI "Influenza like Illness" is defined as fever 100?F with a cough and/or sore throat. 2 Specimens tested by WHO/NREVSS collaborating laboratories and IDPH laboratories. 3 For the purpose of diagnosis, influenza can be diagnosed by using the following test: reverse transcription polymerase chain reaction RT-PCR], viral culture, Immunofluorescence [Direct Fluorescent Antibody (DFA) or Indirect Fluorescent Antibody (IFA) Staining], Enzyme Immuno Assay (EIA) or any rapid diagnostic test. Sensitivities of rapid diagnostic tests are approximately 50-70% when compared with viral culture or reverse transcription polymerase chain reaction (RT-PCR), and specificities of rapid diagnostic tests for influenza are approximately 90-95%. False-positive (and true-negative) results are more likely to occur when disease prevalence in the community is low, which is generally at the beginning and end of the influenza seasons. False-negative (and true-positive) results are more likely to occur when disease prevalence is high in the community, which is typically at the height of the influenza season. 4 Beginning with week 44 (October 29, 2017), 2017-2018 influenza-like illness data from Chicago sentinel providers are included; previous seasonal ILI data excluded Chicago participants.

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Sentinel Provider Reports

ILI Percent

Percent of ILI Reported From Sentinel Providers by Region, Illinois, 2019-2020

8.00%

7.00%

6.00%

5.00%

4.00%

3.00%

2.00%

1.00%

0.00% 40 41 42 43 44 45 46 47 48 49 50 51 52 53 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 MMWR Week

Rockford Region

Peoria Region

Edwardsville Region Marion Region

Champaign Region West Chicago Region Cook County/Chicago Region

Proportion Of ILI Office Visits by Age Group, Illinois, Influenza Season 2018-2020

0-4 YRS

5-24 YRS

25-49 YRS

50-64 YRS

GREATER THAN 64 YRS

2500

2000

1500

1000

500

0

Number of ILI Visits

10/6/2018 10/20/2018

11/3/2018 11/17/2018

12/1/2018 12/15/2018 12/29/2018

1/12/2019 1/26/2019

2/9/2019 2/23/2019

3/9/2019 3/23/2019

4/6/2019 4/20/2019

5/4/2019 5/18/2019 10/5/2019 10/19/2019 11/2/2019 11/16/2019 11/30/2019 12/14/2019 12/28/2019 1/11/2020 1/25/2020

2/8/2020 2/22/2020

3/7/2020 3/21/2020

4/4/2020 4/18/2020

5/2/2020 5/16/2020

Week Ending

Become an Illinois Sentinel Provider

Illinois outpatient health care providers are encouraged to join the Illinois influenza surveillance program. Each week, providers report data to CDC on the number of patients seen and the number with influenza-like illness. These reporters are critical to determining when and where influenza activity is occurring and who it is affecting. For more information on how to participate, contact DPH.INFLUENZA@

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Percent ILI

10/13/2018 10/27/2018 11/10/2018 11/24/2018

12/8/2018 12/22/2018

1/5/2019 1/19/2019

2/2/2019 2/16/2019

3/2/2019 3/16/2019 3/30/2019 4/13/2019 4/27/2019 5/11/2019 Season Break 10/12/2019 10/26/2019 11/9/2019 11/23/2019 12/7/2019 12/21/2019

1/4/2020 1/18/2020

2/1/2020 2/15/2020 2/29/2020 3/14/2020 3/28/2020 4/11/2020 4/25/2020

5/9/2020

10.00% 9.00% 8.00% 7.00% 6.00% 5.00% 4.00% 3.00% 2.00% 1.00% 0.00%

Influenza Like Illness Outpatient Surveillance 2018-2020

ILI

Illinois Regional Baseline

Week Ending

Illinois Influenza-associated Intensive Care Unit (ICU) Admissions

Age 0-4 5-24 25-49 50-64 >65 Total

Current Week 8 0 5 7 36 56

Season Total (9/29/2019 ? Current Week) 13 20 26 42 98 199

Influenza Related ICU Admissions by Age Group, Illinois, 2018-2020

0-4 Years 5-24 Years 25-49 Years 50-64 Years 65 Years and Above 160 140 120 100 80 60 40 20

0

Week Ending

3

Number of ICU Admissions

2019-2020 Illinois Laboratory Surveillance (IDPH, NREVSS, & ACL Laboratories)

A

A

A

B

B

B

(H1N1) (H3)

(Sub-type Unknown)

(Victoria Lineage)

(Yamagata Lineage)

(Lineage Unknown)

Current

9

4

35

15

0

62

Week

Season

61

44

188

107

1

336

Total

Influenza Isolates Reported by WHO/NREVSS Collaborating Laboratories, IDPH Lab & ACL Labs, lllinois, Influenza Season 2019-2020

A (H1)

250

2009(A)H1N1

A (H3)

A(Unable to subtype)

A(Subtyping not performed)

Total Infl B

200

150

100

50

0

% Positive

20% 18% 16% 14% 12% 10% 8% 6% 4% 2% 0%

Number of Positive Specimens

10/5/2019 10/12/2019 10/19/2019 10/26/2019

11/2/2019 11/9/2019 11/16/2019 11/23/2019 11/30/2019 12/7/2019 12/14/2019 12/21/2019 12/28/2019

1/4/2020 1/11/2020 1/18/2020 1/25/2020

2/1/2020 2/8/2020 2/15/2020 2/22/2020 2/29/2020 3/7/2020 3/14/2020 3/21/2020 3/28/2020 4/4/2020 4/11/2020 4/18/2020 4/25/2020 5/2/2020 5/9/2020 5/16/2020

Percent Positive

Week Ending

Vaccination is the best way to protect against influenza infection. All Illinois residents aged six months and older should be vaccinated annually.

Flu vaccination can keep you from getting sick with flu. Flu vaccination can reduce the risk of flu-associated hospitalization, including among children and older

adults. Flu vaccination is an important preventive tool for people with chronic health conditions. Vaccination helps protect women during and after pregnancy. Getting vaccinated also protects the

developing baby during pregnancy and for several months after the baby is born. Flu vaccination also may make your illness milder if you do get sick. Getting vaccinated yourself also protects people around you, including those who are more vulnerable to

serious flu illness, like babies and young children, older people, and people with certain chronic health conditions.

4

Region

Rockford Peoria Edwardsville Marion Champaign West Chicago Chicago/Cook

Influenza Outbreaks in Institutional Settings

Current Week 1

Season Total (9/29/2019 ? Current Week)

1

0

2

0

0

0

1

0

1

2

7

1

3

Total

4

15

Number of Outbreaks

Influenza Outbreaks by First Onset Date, Illinois, 2019-2020

20

Number of Influenza-Related Outbreaks

18

16

14

12

10

8

6

4

2

0

10/5/2019 10/12/2019 10/19/2019 10/26/2019

11/2/2019 11/9/2019 11/16/2019 11/23/2019 11/30/2019 12/7/2019 12/14/2019 12/21/2019 12/28/2019

1/4/2020 1/11/2020 1/18/2020 1/25/2020

2/1/2020 2/8/2020 2/15/2020 2/22/2020 2/29/2020 3/7/2020 3/14/2020 3/21/2020 3/28/2020 4/4/2020 4/11/2020 4/18/2020 4/25/2020 5/2/2020 5/9/2020 5/16/2020

Week Ending

Resources

? IDPH Seasonal Influenza ? IDPH Immunization ? CDC Influenza ? CDC Influenza Vaccine ? CDC Flu Forecasting ? Cook County Influenza Report ? DuPage County Influenza Report ? Kane County Influenza Report ? 2019-2020 Vaccine Recommendations

Summary

? Vaccine Finder ? Immunization Action Coalition ? National Respiratory and Enteric Virus

Surveillance System (NREVSS), CDC ? CDC FluView Activity Report and Maps ? International influenza surveillance (WHO) ? VFC Provider Search ? I-CARE Immunization Registry ? FluVaxView Interactive (influenza vaccine

coverage estimates)

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Syndromic Surveillance

Percent ILI

Influenza-Like Illness Percent by Season, Illinois Syndromic Surveillance, 2013-2020

8.0

7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0

40 41 42 43 44 45 46 47 48 49 50 51 52 53 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

MMWR week

2013-14 2014-15 2015-16 2016-17 2017-18 2018-19 2019-20

Percent ILI

ED Influenza-Like Illness Percent, Syndromic Surveillance, 2018-2020

7.0

National

6.0

HHS region 5

5.0

IL

4.0

3.0

2.0

1.0

0.0

2018-40 2018-42 2018-44 2018-46 2018-48 2018-50 2018-52 2019-02 2019-04 2019-06 2019-08 2019-10 2019-12 2019-14 2019-16 2019-18 2019-20 2019-22 2019-24 2019-26 2019-28 2019-30 2019-32 2019-34 2019-36 2019-38 2019-40 2019-42 2019-44 2019-46 2019-48 2019-50 2019-52 2020-02 2020-04 2020-06 2020-08 2020-10 2020-12 2020-14 2020-16 2020-18 2020-20

MMWR week

Illinois Department of Public Health collects Emergency Department visits daily from all acute care hospitals in Illinois for syndromic surveillance reporting. In this report, visits are classified at Influenza-like Illness (ILI) based on chief complaints that include terms for influenza, or fever and cough or sore throat, similar to the ILINet definition while excluding terms unrelated to ILI presentation, such as a flu shots or stomach flu. Data presented here should be comparable to the results from ILI sentinel reporting, and for some hospital EDs this data is incorporated into ILINet directly to improve coverage and representation in regions of IL with few sentinel providers. For more information about the syndromic surveillance in Illinois visit . The IDPH syndromic surveillance system is supported by the CDC's National Syndromic Surveillance Program, which is where data on the HHS Region 5 and National ILI trends are derived. Visit for more information.

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