2022-2023 Seasonal Influenza Surveillance
Surveillance reports are posted weekly during the flu season.
Summaries of previous flu seasons in South Dakota
- 2020-2021 | 2019-2020 | 2018-2019 | 2016-2017 | 2015-2016 | 2014-2015 | 2013-2014 | 2012-2013 | 2011-2012 | 2010-2011 | 2009-2010
- See the CDC website for national surveillance reports during influenza season.
South Dakota reports influenza activity to the Centers for Disease Control and Prevention using the following CDC definitions.
| Influenza-like illness (ILI) | Fever ≥ 100 degrees F and cough or sore throat |
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| No Activity | Overall clinical activity remains low and there are no lab confirmed cases |
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| Sporadic Activity | Isolated cases of lab confirmed influenza in the state; Influenza-Like-Illness (ILI) activity is not increased. |
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| Local Activity | Increased ILI within a single region** AND recent (within the past 3 weeks) laboratory evidence of influenza in that region. ILI activity in other regions is not increased. |
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| 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. |
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| 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. |