Each week during influenza season (October through May), Michigan Department of Health & Human Services (MDHHS) reports the estimated level of influenza activity in the state to the Centers for Disease Control and Prevention (CDC). The five levels, from lowest to highest, are:
- No activity: No lab-confirmed cases of influenza and no reported increase in the number of cases of influenza-like illness (ILI).
- Sporadic: Isolated lab-confirmed influenza cases or a single influenza outbreak has been reported, but no increase in ILI activity.
- Local: Outbreaks of Influenza or increases in ILI cases and recent laboratory-confirmed influenza in a single region of the state.
- Regional: Outbreaks of influenza or increases in ILI and recent laboratory confirmed Influenza in at least 2 regions of the state.
- Widespread: Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in at least half the regions of the state with recent laboratory evidence of influenza in the state.
![Portrait of a young woman sneezing In to tissue](https://www.wupdhd.org/wp-content/uploads/2020/03/girl-with-the-flu-cropped-807x350.jpg)
Weekly Influenza surveillance information is available by visiting the Michigan Flu Focus Newsletter.
Additional information about Influenza can be found at the Centers for Disease Control Influenza Center