2014-2015 Seasonal Influenza Surveillance
Surveillance reports are posted weekly during the flu season.
- Week 18 Summary (ending May 9)
Note: This is last weekly summary for the 2014-2015 flu season.
Summaries of previous flu seasons in South Dakota
- 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° F and cough or sore throat|
|No Activity||Overall clinical activity remains low and there are no lab confirmed cases|
|Sporadic Activity||Isolated cases of lab confirmed influenza in the state; Influenza-Like-Illness (ILI) activity is not increased.|
|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.|
|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.|
|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.|