Influenza Surveillance

Percentage of Visits for Influenza-like Illness (ILI) Reported by ILINet* Sites and ESSENCE**, Kansas, October 2019 – Present

Influenza-like  Illness (ILI) Reported by ILINet* Sites and ESSENCE

*ILINet sites may vary in number and type (student health, family practice, etc.) each season. ILINet sites monitor outpatient visits and may be more likely to report data if patients are presenting with influenza-like illness. The information on this chart may change over time, as ILINet sites may adjust their data submissions, and additional submissions may be received after Tuesday's deadline.

  **ESSENCE is a syndromic surveillance system for capturing and analyzing electronic health records from emergency departments. ESSENCE data is near real-time.

Laboratory-Confirmed Influenza Viruses from Specimens at KHEL by Subtype, October 2019 – Present

Influenza subtype


Percent of Total

A/H3 0 0%
A/H1 56 97%
A (not subtyped) 1 2%
B (Yamagata) 0 0%
B (Victoria) 1 2%

Kansas Weekly Influenza Surveillance Report

About Influenza Surveillance in Kansas

Kansas regulations do not require health care providers to report cases of influenza to KDHE except for pediatric deaths a novel A infection. Instead, influenza activity is measured through seven components: the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet), syndromic surveillance (ESSENCE), laboratory surveillance, respiratory panel testing, influenza-associated hospitalizations, outbreaks, and pneumonia and influenza mortality. All components are updated in the weekly influenza surveillance report.


ILINet is a collaboration between the Centers for Disease Control and Prevention (CDC) and state, local, and territorial health departments. ILINet in Kansas is represented by family practices, emergency departments, student health centers, and pediatric offices.

Each week, ILINet clinics determine the percentage of patients seen with influenza-like illness (ILI). Influenza-like illness is defined as fever (>100°F) with cough and/or sore throat, in the absence of a known cause other than influenza. Data is collected from Sunday through Saturday of each week. Clinics are asked to submit the previous week's data by noon each Tuesday.

Syndromic Surveillance

The Electronic Surveillance System for the Early Notification of Community-Based Epidemics (ESSENCE) is a syndromic surveillance system for capturing and analyzing public health indicators in near real-time for detection of disease outbreaks. As of 9/25/18, 88 Kansas emergency departments are submitting data accessible through ESSENCE, accounting for 83% of the emergency room visits statewide. Regional and statewide charts can be viewed on the weekly influenza surveillance report.

Laboratory Surveillance

The Kansas Health and Environmental Laboratories (KHEL) provides confirmatory testing for ILINet site patients with ILI, as well as for hospitalized patients throughout the state. Real-time reverse transcription polymerase chain reaction (RT-PCR) tests were used to analyze nasal and nasopharyngeal swabs for the presence of influenza virus. In addition, KHEL receives prescreened influenza A specimens to meet surveillance goals set by CDC.

Respiratory Panel Testing

All nasopharyngeal specimens that test negative for influenza at KHEL are tested using the BioFire multiplex PCR instrument. This test probes for 17 viral and 3 bacterial targets. Via Christi Laboratories in Sedgwick County share their respiratory panel results monthly with KDHE.


While individual cases of influenza with the exception of pediatric deaths and novel A infections are not reportable, outbreaks of any disease are reportable to KDHE. Epidemiology staff at KDHE provides prevention and control recommendations for reporting facilities.

Pneumonia & Influenza Mortality

Percent of Deaths Associated with Pneumonia and Influenza by Surveillance Period, Kansas, October 2018 - Present

Percent of Deaths Associated with  Pneumonia and Influenza by Surveillance Period


Kansas Resident Pneumonia & Influenza Related Deaths by Selected Entire Flu Seasons
by Causal Relationship, Current Season is only Season to Date
Time Period based on Date of Death

2018-19 Season 2019-20 Season 2020-21 Season
N Percent N Percent N Percent
Influenza - Contributing Cause of Death Only 21 1.5 24 1.6 0 0
Influenza - Direct Cause of Death 76 5.3 117 7.6 0 0
Pneumonia - Direct Cause of Death 370 25.7 376 24.4 63 10.8
Pneumonia - Contributing Cause of Death Only 973 67.6 1024 66.5 518 89.2
Total 1440 100.0 1541 100.0 581 100.0

Source: Kansas Department of Health and Environment - Division of Health
Bureau of Epidemiology and Public Health Informatics
Prepared November 16, 2020
Note: Influenza reporting seasons run from September 1 through May 31 of following year
Influenza and Pneumonia frequently occur together during a flu season resulting in reporting of both on death certificates.


Past Influenza Surveillance Reports

National Influenza Surveillance

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