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 [email protected]. 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
en
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
er
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 [email protected] 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
3/3
1/2
018
4/1
4/2
018
4/2
8/2
018
5/1
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
0/2
019
4/1
3/2
019
4/2
7/2
019
5/1
1/2
019
Perc
en
t IL
I
Week Ending
Influenza Like Illness Outpatient Surveillance 2017-2019 ILI Illinois Regional Baseline
0
50
100
150
200
250
300
350
Nu
mb
er
of
ICU
Ad
mis
sio
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
2/2
019
1/1
9/2
019
1/2
6/2
019
2/2
/201
9
2/9
/201
9
2/1
6/2
019
2/2
3/2
019
3/2
/201
9
3/9
/201
9
3/1
6/2
019
3/2
3/2
019
3/3
0/2
019
4/6
/201
9
4/1
3/2
019
4/2
0/2
019
4/2
7/2
019
5/4
/201
9
5/1
1/2
019
5/1
8/2
019
Perc
en
t P
osit
ive
Nu
mb
er
of
Po
sit
ive S
pecim
en
s
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.
5
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
8
10
12
14
16
18
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
2/2
019
1/1
9/2
019
1/2
6/2
019
2/2
/201
9
2/9
/201
9
2/1
6/2
019
2/2
3/2
019
3/2
/201
9
3/9
/201
9
3/1
6/2
019
3/2
3/2
019
3/3
0/2
019
4/6
/201
9
4/1
3/2
019
4/2
0/2
019
4/2
7/2
019
5/4
/201
9
5/1
1/2
019
5/1
8/2
019
Nu
mb
er
of
Ou
tbre
aks
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)
6
Syndromic Surveillance
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
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
en
t IL
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
en
t IL
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.