Influenza Surveillance

Kansas regulations do not require health care providers to report cases of influenza to the Kansas Department of Health and Environment (KDHE) except for pediatric deaths and novel influenza A infections. Instead, influenza activity is measured through surveillance networks including the U.S. Outpatient Influenza-like Illness Network (ILINet) and syndromic surveillance (ESSENCE). 

Percentage of Visits for Influenza-like Illness (ILI) Reported by ILINet Sites, Kansas, October 2022 – Present



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. Data is collected from Sunday through Saturday of each week. Clinics are asked to submit the previous week's data by 11:00 AM 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. Currently, 116 of 138 Kansas emergency departments share data. This is about 96% of all ED patient visits a year. More than 90% of reported ED visits are processed within 24-48 hours of the visit itself, and data is subject to change. Syndromic data does not include direct admits or transfers. 

Percentage of Visits for Influenza-like Illness (ILI) Reported to ESSENCE, Kansas, October 2022 – Present

syndromic surveillance

Influenza vs. COVID-19

For County-Level Influenza vs. COVID-19 trends, and overall trends in respiratory illness + fever, see the COVID-19 Data Dashboard. Data is updated weekly.

Laboratory Data

All pre-screened positive influenza specimens submitted by large hospitals and all nasopharyngeal and nasal swabs submitted to the Kansas Health and Environmental Laboratories for COVID-19 testing are tested on a multiplex PCR assay with includes influenza A, influenza B, respiratory syncytial virus, and rhinovirus/enterovirus targets. If either target is detected, further typing is performed on those specimens.

Number of Specimens Tested for Influenza at the Kansas Health and Environmental Laboratories by Week Ending Date, Kansas, October 2022 – Present

Week Ending Date Influenza A/H3 Influenza A/H1 Influenza A (not subtyped Influenza B Respiratory Syncytial Virus Rhinovirus/Enterovirus  Negative
10/08/2022 0 0 0 0 0 0 175
10/15/2022 0 0 0 0 0 0 71
10/22/2022 1 0 0 0 0 1 60
10/29/2022 1 0 0 0 0 0 71
11/05/2022 0 0 0 0 1 0 158
11/12/2022 2 0 1 0 2 0 88
11/19/2022 9 3 13 0 2 0 47
11/26/2022 7 1 8 0 0 0 25

Percent of Deaths Associated with Pneumonia & Influenza by Surveillance Period, Kansas, October 2020 to Present

Pneumonia Influenza Death Chart

Pneumonia & Influenza Mortality

Kansas resident pneumonia and influenza-related deaths by selected entire flu seasons by causal relationship, the current season is the only season to the date time period based on the date of death.

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

Season 2020-21 Season  N/A 2021-2022 Season  N/A 2022-2023 Season

N/A N Percent N Percent N Percent
Influenza - Contributing Cause of Death Only  0 0 12 0.4 1 .3
Influenza - Direct Cause of Death  4 0.1 32 1.1 7 2.0
Pneumonia - Direct Cause of Death  312 10.3 306 10.2 82 23.3
COVID-associated Pneumonia - Contributing Cause of Death Only 1968 64.7 1762 58.6 53 15.1
Pneumonia - Contributing Cause of Death Only  758 24.9 893 29.7 209 59.4
Total 3042 100.0 3005 100.0 352 100.0

Source: Kansas Department of Health and Environment - Division of Health Bureau of Epidemiology and Public Health Informatics. Prepared November 28, 2022. 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.