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 2024 – Present
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 designed to capture and analyze public health indicators in near real-time for early detection of disease outbreaks. Currently, 126 out of 138 Kansas emergency departments share data, accounting for about 98% of all annual ED patient visits. More than 90% of reported ED visits are processed within 24-48 hours of the visit itself, though please note that 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 2024 – Present
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 2024 – Present
| Week Ending Date | Total Influenza A |
Influenza A/H3 | Influenza A/H1 | Influenza B | Influenza B(Victoria) | Influenza B(Yamagata) | Negative |
|---|---|---|---|---|---|---|---|
| 10/05/2024 | 0 | 0 | 0 | 0 | 0 | 0 | 10 |
| 10/12/2024 | 0 | 0 | 0 | 0 | 0 | 0 | 9 |
| 10/19/2024 | 0 | 0 | 0 | 0 | 0 | 0 | 7 |
| 10/26/2024 | 0 | 0 | 0 | 0 | 0 | 0 | 14 |
| 11/02/2024 | 0 | 0 | 0 | 0 | 0 | 0 | 8 |
| 11/09/2024 | 0 | 0 | 0 | 0 | 0 | 0 | 12 |
| 11/16/2024 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
Percent of Deaths Associated with Pneumonia & Influenza by Surveillance Period, Kansas, October 2020 to Present
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 | 2022-2023 Season
|
N/A | 2023-2024 Season | N/A | 2024-2025 Season | N/A |
|---|---|---|---|---|---|---|
| N/A | N | Percent | N | Percent | N | Percent |
| Influenza - Contributing Cause of Death Only | 32 | 2.0 | 14 | 1.1 | 0 | 0 |
| Influenza - Direct Cause of Death | 96 | 6.0 | 60 | 4.7 | 2 | 0.7 |
| Pneumonia - Direct Cause of Death | 329 | 20.7 | 307 | 24.2 | 75 | 27.9 |
| COVID-associated Pneumonia - Contributing Cause of Death Only | 228 | 14.3 | 129 | 10.2 | 24 | 8.9 |
| Pneumonia - Contributing Cause of Death Only | 904 | 57.0 | 756 | 59.7 | 168 | 62.5 |
| Total | 1589 | 100.0 | 1266 | 100.0 | 269 | 100.0 |
Source: Kansas Department of Health and Environment - Division of Health Bureau of Epidemiology and Public Health Informatics. Prepared November 18, 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.