Influenza-like illness ( ILI ) surveillance
Influenza Activity Report 2012-2013 Influenza Season
2013
- Week Ending May 18, 2013(MMWR Week 20) [pdf 400k]
- Week Ending May 11, 2013(MMWR Week 19) [pdf 389k]
- Week Ending May 4, 2013(MMWR Week 18) [pdf 397k]
- Week Ending April 27, 2013(MMWR Week 17) [pdf 391k]
- Week Ending April 20, 2013(MMWR Week 16) [pdf 381k]
- Week Ending April 13, 2013(MMWR Week 15) [pdf 388k]
- Week Ending April 6, 2013(MMWR Week 14) [pdf 388k]
- Week Ending March 30, 2013(MMWR Week 13) [pdf 183k]
- Week Ending March 23, 2013(MMWR Week 12) [pdf 183k]
- Week Ending March 16, 2013(MMWR Week 11) [pdf 385k]
- Week Ending March 9, 2013(MMWR Week 10) [pdf 387k]
- Week Ending March 2, 2013(MMWR Week 9) [pdf 387k]
- Week Ending February 23, 2013(MMWR Week 8) [pdf 387k]
- Week Ending February 16, 2013(MMWR Week 7) [pdf 385k]
- Week Ending February 9, 2013(MMWR Week 6) [pdf 385k]
- Week Ending February 2, 2013(MMWR Week 5) [pdf 385k]
- Week Ending January 26, 2013(MMWR Week 4) [pdf 519k]
- Week Ending January 19, 2013(MMWR Week 3) [pdf 385k]
- Week Ending January 12, 2013(MMWR Week 2) [pdf 382k]
- Week Ending January 5, 2013(MMWR Week 1) [pdf 389k]
2012
- Week Ending December 29, 2012 (MMWR Week 52) [pdf 377k]
- Week Ending December 22, 2012 (MMWR Week 51) [pdf 413k]
- Week Ending December 15, 2012 (MMWR Week 50) [pdf 417k]
- Week Ending December 8, 2012 (MMWR Week 49) [pdf 416k]
- Week Ending December 1, 2012 (MMWR Week 48) [pdf 414k]
- Week Ending November 24, 2012 (MMWR Week 47) [pdf 421k]
- Week Ending November 18, 2012 (MMWR Week 46) [pdf 422k]
- Week Ending November 10, 2012 (MMWR Week 45) [pdf 419k]
- Week Ending November 3, 2012 (MMWR Week 44) [pdf 419k]
- Week Ending October 27, 2012 (MMWR Week 43) [pdf 418k]
- Week Ending October 20, 2012 (MMWR Week 42) [pdf 418k]
- Week Ending October 13, 2012 (MMWR Week 41) [pdf 417k]
- Week Ending October 6, 2012 (MMWR Week 40) [pdf 417k]
Definitions of Weekly Flu Activity Levels
- No Activity- Indicators of influenza-like illness below state baseline1 levels and no laboratory-confirmed2 cases of influenza.
- Sporadic – Elevated indicators3 of influenza-like illness in a single county and at least one laboratory confirmed case2 of influenza anywhere in the state.
OR
At least one laboratory-confirmed2 influenza outbreak in an institution anywhere in the state
- Local – Elevated indicators3 of influenza-like illness in a single county and recent4 laboratory-confirmed2 influenza cases from that same county. (There may be other counties elevated above baseline1 without laboratory-confirmed2 cases.)
OR
Laboratory-confirmed2 influenza outbreaks in two or more institutions in a single county.
- Regional --Elevated indicators3 of influenza-like illness in from two to 10 counties and recent2 laboratory confirmed2 influenza cases from these same counties.
OR
Confirmed2 influenza outbreaks reported in institutions in from 2 to 10 counties.
- Widespread – Elevated indicators3 of influenza-like illness in more than 10 counties and recent4 laboratory-confirmed2 cases of influenza.
OR
Influenza outbreaks in institutions in more than 10 counties and recent4 laboratory-confirmed2 cases of influenza.
1 Baseline refers to the level of influenza-like illness in the months when seasonal influenza virus is less likely to be circulating. Baseline is determined by averaging the statewide percentages of ILI over a three-year period, using data only from the months of May through August. (The calculation does not include weeks in which fewer than four counties reported any data.)
2 Confirmed by viral culture or PCR testing.
3 This means at least two of the following sectors – schools, emergency departments, long-term care facilities, healthcare providers – are reporting rates of ILI above baseline levels.
4 Within the previous three weeks.
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