1

INFLUENZA SURVEILLANCE UPDATE ILLINOIS DEPARTMENT OF PUBLIC HEALTH

Division of Infectious Disease

Week 7: Week Ending Saturday, February 16, 2019

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@illinois.gov. Additional reports on influenza in Chicago can be found on the City of Chicago Influenza Website

Current Week Quick Stats

Illinois Influenza Geographic Spread Widespread

Percent of Outpatient Visits for ILI1, 4 2.76 % (baseline 1.8%)

Percent/Number of Influenza Positive Tests2 Current Week: 12.8% (81/635); Season: 5.9% (905/15215)

Influenza-Associated ICU Admissions3 Current Week: 44; Season: 503

Influenza Outbreaks Current Week: 5; Season: 43

Influenza-Associated Pediatric Deaths (Season Total) 3

Illinois Sentinel Influenza-Like Illness (ILI) Surveillance

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.

0.00%

1.00%

2.00%

3.00%

4.00%

5.00%

6.00%

7.00%

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

Perc

en

t IL

I

MMWR Week

Influenza-Like Illness by Season, IllinoisAverage, 2011-12 through 2017-18 2015-16 2016-17 2017-18 2018-19

2

Sentinel Provider Reports

Become an Illinois Sentinel Provider

0.00%

1.00%

2.00%

3.00%

4.00%

5.00%

6.00%

7.00%

8.00%

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

ILI P

erc

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t

MMWR Week

Percent of ILI Reported From Sentinel Providers by Region, Illinois, 2018-2019

Rockford Region

Peoria Region

EdwardsvilleRegion

Marion Region

ChampaignRegion

West ChicagoRegion

CookCounty/ChicagoRegion

0

200

400

600

800

1000

1200

10/7

/20

17

10/2

1/2

017

11/4

/20

17

11/1

8/2

017

12/2

/20

17

12/1

6/2

017

12/3

0/2

017

1/1

3/2

018

1/2

7/2

018

2/1

0/2

018

2/2

4/2

018

3/1

0/2

018

3/2

4/2

018

4/7

/201

8

4/2

1/2

018

5/5

/201

8

5/1

9/2

018

10/6

/20

18

10/2

0/2

018

11/3

/20

18

11/1

7/2

018

12/1

/20

18

12/1

5/2

018

12/2

9/2

018

1/1

2/2

019

1/2

6/2

019

2/9

/201

9

2/2

3/2

019

3/9

/201

9

3/2

3/2

019

4/6

/201

9

4/2

0/2

019

5/4

/201

9

5/1

8/2

019

Nu

mb

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of

ILI V

isit

s

Week Ending

Proportion Of ILI Office Visits by Age Group, Illinois, Influenza Season 2017-2019

0-4 YRS 5-24 YRS 25-49 YRS 50-64 YRS GREATER THAN 64 YRS

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@ILLINOIS.GOV or complete the sign-up

form and fax to 217-524-0962 to join the sentinel program.

3

0.00%

1.00%

2.00%

3.00%

4.00%

5.00%

6.00%

7.00%

8.00%

9.00%

10.00%

10/1

4/2

017

10/2

8/2

017

11/1

1/2

017

11/2

5/2

017

12/9

/20

17

12/2

3/2

017

1/6

/201

8

1/2

0/2

018

2/3

/201

8

2/1

7/2

018

3/3

/201

8

3/1

7/2

018

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018

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4/2

018

4/2

8/2

018

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2/2

018

Se

ason B

rea

k

10/1

3/2

018

10/2

7/2

018

11/1

0/2

018

11/2

4/2

018

12/8

/20

18

12/2

2/2

018

1/5

/201

9

1/1

9/2

019

2/2

/201

9

2/1

6/2

019

3/2

/201

9

3/1

6/2

019

3/3

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5/1

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Perc

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Week Ending

Influenza Like Illness Outpatient Surveillance 2017-2019 ILI Illinois Regional Baseline

0

50

100

150

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250

300

350

Nu

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ICU

Ad

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ns

Week Ending

Influenza Related ICU Admissions by Age Group, Illinois, 2017-2019

0-4 Years 5-24 Years 25-49 Years 50-64 Years 65 Years and Above

Illinois Influenza-associated Intensive Care Unit (ICU) Admissions

Age Current Week Season Total (9/30/2018 – Current Week) 0-4 6 49 5-24 3 30 25-49 4 84 50-64 12 148 >65 19 192 Total 44 503

4

2018-2019 Illinois Laboratory Surveillance (IDPH, NREVSS, & ACL Laboratories)

A (H1N1)

A (H3)

A (Sub-type Unknown)

B (Victoria Lineage)

B (Yamagata

Lineage)

B (Lineage

Unknown)

Current Week

52 9 15 0 1 4

Season Total

369

47 440 0 3 46

0%

2%

4%

6%

8%

10%

12%

14%

16%

18%

20%

0

50

100

150

200

250

10/6

/20

18

10/1

3/2

018

10/2

0/2

018

10/2

7/2

018

11/3

/20

18

11/1

0/2

018

11/1

7/2

018

11/2

4/2

018

12/1

/20

18

12/8

/20

18

12/1

5/2

018

12/2

2/2

018

12/2

9/2

018

1/5

/201

9

1/1

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019

1/1

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019

1/2

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2/2

/201

9

2/9

/201

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2/1

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019

2/2

3/2

019

3/2

/201

9

3/9

/201

9

3/1

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3/2

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019

3/3

0/2

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4/6

/201

9

4/1

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4/2

0/2

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4/2

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5/4

/201

9

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019

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Week Ending

Influenza Isolates Reported by WHO/NREVSS Collaborating Laboratories, IDPH Lab & ACL Labs, lllinois, Influenza Season 2018-2019

A (H1) 2009(A)H1N1 A (H3) A(Unable to subtype) A(Subtyping not performed) Total Infl B % Positive

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.

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Influenza Outbreaks in Institutional Settings

Region Current Week Season Total (9/30/2018 – Current Week)

Rockford 0 3

Peoria 0 4

Edwardsville 0 5

Marion 2 3

Champaign 0 4

West Chicago 2 15

Chicago/Cook 1 9

Total 5 43

Resources

0

2

4

6

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10/6

/20

18

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018

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/20

18

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3/3

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4/6

/201

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5/4

/201

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Week Ending

Influenza Outbreaks by First Onset Date, Illinois, 2018-2019

Number of Influenza-Related Outbreaks

IDPH Seasonal Influenza

IDPH Immunization

CDC Influenza

CDC Influenza Vaccine

Cook County Influenza Report

DuPage County Influenza Report

Kane County Influenza Report

2018-2019 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

0.0

1.0

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4.0

5.0

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8.0

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

Perc

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I

MMWR week

2013-14

2014-15

2015-16

2016-17

2017-18

2018-19

Influenza-Like Illness Percent by Season, Illinois Syndromic Surveillance, 2013-2019

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

Perc

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I

MMWR week

National

HHS region 5

IL

ED Influenza-Like Illness Percent, Syndromic Surveillance, 2017-2019 Seasons

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 http://dph.illinois.gov/data-

statistics/syndromic-surveillance. 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 https://www.syndromicsurveillance.org/ for more information.