1Influenza-like illness (ILI) is defined as fever ≥ 100°F with a cough and/or sore throat.
2ILI Activity is defined by: Low (0-3 standard deviations above ED mean), Moderate (4-7 standard deviations above ED mean), and Elevated (8+ standard deviations above ED mean).
3The Kane County Health Department tracks seasonal influenza absenteeism and laboratory testing through ILI surveillance reporting. Emergency department visits related to ILI are automatically tracked through the Electronic Surveillance System for the Early Notification of Community-based Epidemics (ESSENCE). ED visits of interest were identified using the ILI chief complaint and discharge diagnosis query definition.
4Rapid influenza testing cannot distinguish influenza infections caused by novel influenza A viruses. The sensitivity of this type of testing has been shown to range between 20-100% for seasonal influenza viruses. A negative result does not exclude influenza virus infection.
5Baseline for Emergency Department (ED) related visits was calculated using the mean percentage of visits and adding two standard deviations from 2017-18, 2018-19, select weeks in 2019-2020, 2021-22, and 2022-23 influenza season data for non-influenza weeks. Non-influenza weeks are defined as two or more consecutive weeks when each week accounts for less than 2% of the season’s total positive influenza specimens in Kane County labs.
6The National Snapshot comes directly from the FluView interactive portal prepared by the CDC Influenza Division using ILINet data. FluView can be accessed at https://gis.cdc.gov/grasp/fluview/main.html.
*All data in this report are provisional.
The Kane County Health Department thanks all surveillance partners for assisting with collecting and sharing this information.
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