Influenza Surveillance

About Influenza Surveillance in Kansas

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 2023 – Present

2022 ILINet CHART

ILINet

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, 126 of 138 Kansas emergency departments share data. This is about 98% 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 2023 – Present

syndromic surveillance

Influenza and COVID-19

To observe trends for influenza, COVID-19, and respiratory syncytial virus (RSV), please refer to the Kansas Syndromic Surveillance Program Dashboard. Data is updated weekly.

Laboratory Data

The Respiratory Illness Surveillance and Epidemiology Network, or RISENet, is a newly implemented surveillance project that aims to enhance our ability to monitor activity of influenza, COVID-19, and RSV through laboratory testing. Facilities enrolled in the RISENet program collect specimens from individuals in outpatient settings with suspected respiratory illnesses and send them to the Kansas Health and Environmental Laboratories (KHEL) for testing, aiming to better understand regional circulation. All nasopharyngeal and nasal swabs submitted to KHEL under this program are tested using a multiplex PCR assay which includes influenza, RSV, and COVID-19. Additionally, KHEL will perform further characterizations of the specimens, such as influenza subtyping or COVID-19 genomic sequencing.

Number of Specimens Tested for Influenza at the Kansas Health and Environmental Laboratories by Week Ending Date, Kansas, October 2023 – Present

Week Ending Date Influenza A/H3 Influenza A/H1 Influenza A (not subtyped Influenza B  Influenza B(Victoria) Influenza B(Yamagata) Respiratory Syncytial Virus Negative
10/07/2023 0 0 0 0 0 0 0 30
10/14/2023 0 0 0 0 0 0 0 24
10/21/2023 0 0 0 0 0 0 0 28
10/28/2023 0 0 0 0 0 0 0 39
11/04/2023 0 1 1 0 0 0 0 32
11/11/2023 0 0 0 0 0 0 0 37
11/18/2023 0 0 0 0 0 0 0 36
11/25/2023 0 0 0 0 0 0 0 18
12/02/2023 0 0 2 0 0 0 0 34
12/09/2023 0 1 11 4 0 0 0 46
12/16/2023 3 2 12 4 2 0 1 31
12/23/2023 0 0 0 0 0 0 0 23
12/30/2023 2 1 3 0 0 0 1 22
01/06/2024 0 0 0 0 0 0 2 21
01/13/2024 0 0 0 2 2 0 0 15
01/20/2024 2 1 3 0 0 0 2 05
01/27/2024 2 0 3 0 0 0 0 13
02/03/2024 0 2 2 1 1 0 2 54

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 2021-2022 Season  N/A 2022-2023 Season

N/A 2023-2024 Season N/A
N/A N Percent N Percent N Percent
Influenza - Contributing Cause of Death Only  12 0.4 32 2.0 6 0.8
Influenza - Direct Cause of Death  33 1.1 96 6.0 28 3.8
Pneumonia - Direct Cause of Death  308 10.2 328 20.6 159 21.6
COVID-associated Pneumonia - Contributing Cause of Death Only 1765 58.7 228 14.3 97 13.2
Pneumonia - Contributing Cause of Death Only  889 29.6 906 57.0 447 60.7
Total 3007 100.0 1590 100.0 737 100.0

Source: Kansas Department of Health and Environment - Division of Health Bureau of Epidemiology and Public Health Informatics. Prepared February 19, 2024. 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.

  1. Kansas Influenza Archive
  2. National Influenza Surveillance