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2013 - 2014 Flu Activity Report

While influenza is not a reportable disease in Illinois, the Illinois Department of Public Health examines reports from many health care sites throughout the state. These sites include physician offices, emergency departments and nursing homes that report acute illness, and schools that report absenteeism rates. Accordingly, the Department 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.

Year Week Beginning Week Ending Reported Influenza Activity
2014 May 11 May 17 Sporadic
2014 May 4 May 10 Sporadic
2014 April 27 May 3 Sporadic
2014 April 20 April 26 Sporadic
2014 April 13 April 19 Sporadic
2014 April 6 April 12 Local
2014 March 30 April 5 Local
2014 March 23 March 29 Local
2014 March 16 March 22 Local
2014 March 9 March 15 Local
2014 March 2 March 8 Regional
2014 February 23 March 1 Regional
2014 February 16 February 22 Regional
2014 February 9 February 15 Regional
2014 February 2 February 8 Widespread
2014 January 26 February 1 Widespread
2014 January 19 January 25 Widespread
2014 January 12 January 18 Widespread
2014 January 5 January 11 Widespread
2014 December 29 January 4 Widespread
2013 December 22 December 28 Widespread
2013 December 15 December 21 Regional
2013 December 8 December 14 Regional
2013 December 1 December 7 Local
2013 November 24 November 30 Sporadic
2013 November 17 November 23 Sporadic
2013 November 10 November 16 Sporadic
2013 November 3 November 9 Sporadic
2013 October 27 November 2 No Activity
2013 October 20 October 26 No Activity
2013 October 13 October 19 Sporadic
2013 October 6 October 12 No Activity
2013 September 29 October 5 No Activity

No Activity

No lab confirmed cases †

Sporadic Activity

Isolated lab-confirmed cases OR Lab confirmed outbreak in one institution ‡

Local Activity

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 AND recent 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.

*ILI activity can be assessed using a variety of data sources including sentinel providers, school/workplace absenteeism, and other syndromic surveillance systems that monitor influenza-like illness.

Lab confirmed case=case confirmed by rapid diagnostic test, antigen detection, culture, or PCR. Care should be given when relying on results of point of care rapid diagnostic test kits during times when influenza is not circulating widely. The sensitivity and specificity of these tests vary and the predicative value positive may be low outside the time of peak influenza activity. Therefore, a state may wish to obtain laboratory confirmation of influenza by testing methods other than point of care rapid tests for reporting the first laboratory confirmed case of influenza of the season.

Institution includes nursing home, hospital, prison, school, etc.

** Region: population under surveillance in a defined geographical subdivision of a state. A region could be comprised of 1 or more counties and would be based on each state's specific circumstances. Depending on the size of the state, the number of regions could range from 2 to approximately 12. The definition of regions would be left to the state but existing state health districts could be used in many states. Allowing states to define regions would avoid somewhat arbitrary county lines and allow states to make divisions that make sense based on geographic population clusters. Focusing on regions larger than counties would also improve the likelihood that data needed for estimating activity would be available.

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535 West Jefferson Street • Springfield, Illinois 62761 • Phone 217-782-4977 • Fax 217-782-3987 • TTY 800-547-0466
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