2019 - 2020 Flu Activity Report
While influenza is not a reportable disease in Illinois, IDPH examines reports from many health care sites throughout the state. These sites include physician offices, emergency departments, and other clinics that report acute illness with influenza-like illness, and institutional settings such as nursing homes and prisons that report outbreaks. Accordingly, IDPH monitors disease trends and influenza activities as they occur on a weekly basis.
A detailed surveillance report for each week can be viewed by clicking on the desired week in the table below. This weekly surveillance report summarizes regional and state influenza data used to determine the weekly influenza activity level and national activity levels reported by state and territorial epidemiologists.
|Week 40: September 29 - October 5, 2019||No Activity|
|No Activity||No lab confirmed cases †|
|Sporadic Activity||Isolated lab-confirmed cases OR Lab confirmed outbreak in one institution ‡|
Recent (within the past 3 weeks) lab evidence of influenza in region with increased ILI* OR Recent (within the past 3 weeks) lab evidence of influenza in region with the outbreaks; virus activity is no greater than sporadic in other regions**
|Regional Activity||Increased ILI* in >2 but less than half of the regions AND recent (within the past 3 weeks) lab confirmed influenza in the affected regions. OR Institutional outbreaks (ILI or lab confirmed) in >2 and less than half of the regions ANDrecent lab confirmed influenza in the affected regions**. A region is defined as the regions States use for public health purposes.|
|Widespread Activity||Increased ILI* and/or institutional outbreaks (ILI* or lab confirmed) in at least half of the regions** AND recent (within the past 3 weeks) lab confirmed influenza in the state.|