![]() Reported percentages for previous seasons represent final, end of season data and may differ from previously published reports. All data presented here are preliminary and may change as more reports are received. Ending dates are accurate for the current season but are approximations for all other years. On all graphs, the week ending date is displayed. This report is updated on Fridays for the previous Saturday through Sunday. Influenza surveillance data are typically aggregated by week. This includes surveillance for influenza-associated intensive care unit (ICU) hospitalizations, monitoring circulating influenza viruses, as well outpatient and emergency department visits that are due to influenza-like illness (ILI). The Chicago Department of Public Health utilizes various surveillance indicators to monitor influenza activity in Chicago. Visit the CDPH HAN website for more information on how to report. The Illinois Department of Public Health has issued Influenza Testing and Reporting Guidance for the 2023-2024 season.For those without a healthcare provider or whose healthcare providers do not have the influenza vaccine, a schedule of City of Chicago influenza vaccination clinics is available on the city website and by calling 311. Chicagoans should ask their healthcare provider or pharmacist about vaccine availability.Influenza and COVID-19 vaccines can be given at the same visit if the timing coincides. Vaccination is the best way to protect against influenza infection and all Chicagoans six months and older are encouraged to get vaccinated.The proportion of emergency department visits for influenza-like illness (ILI) and the proportion of outpatient visits for ILI are at or above local thresholds.Since October 1, 2023, 966 of 44,182 (2.2%) reported specimens tested for influenza were positive. 226 of 5,574 (4.1%) reported specimens tested for influenza were positive.Since October 1, 2023, 27 influenza-associated ICU hospitalizations have been reported. Nine influenza-associated ICU hospitalizations were reported for the current surveillance week.Influenza activity continues to increase.
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