1Influenza-like illness (ILI) is defined as fever ≥ 100°F with a cough and/or sore throat.
2Respiratory Activity is defined by: Low (0-4% of ED visits were for ILI), Moderate (4-7% of ED visits were for ILI), and High (7% or more of ED visits were for ILI).
3Rapid 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.
4Baseline for Emergency Department (ED) related visits was calculated using the mean percentage of visits and adding two standard deviations from 2018-19, select weeks in 2019-2020, 2021-22, 2022-23, and 2023-24 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. The baseline for ILI-related ED visits is used to determine levels (low, moderate, and high) of Respiratory Illness Activity.
5The 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.
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