2009-2010 influenza surveillance summaries
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Weekly Snapshot updated for Week 9 (ending 3/6/10)
Please note that given the recent decline in influenza activity, only one situation report will be prepared per week until further notice. |
Snapshot updated 3/8/10:
- Emergency department (ED) visits for influenza like illness (ILI) have held steady for over three months, after declining from a peak in fall.
- No laboratory-confirmed influenza hospitalizations with onset after the week ending 2/6/10 have been reported. All laboratory-confirmed influenza hospitalizations with onset of illness in February have been influenza B.
- No laboratory-confirmed influenza deaths have occurred in King County residents since mid-February.
- The percentage of specimens testing positive for influenza from our outpatient surveillance system is below the average proportion observed at this time of year.
- The percentage of rapid antigen tests positive for influenza is below the average proportion observed this time of year.
- Thirteen long-term care facilities reported cases of influenza like illness in their facilities from mid-October through early January. No reports of influenza like illness in long-term care facilities have been received since early January.
- School absenteeism has been low and stable in recent weeks, with the majority of schools reporting <10% of students absent. Some schools were closed for all or part of the week ending 2/20/10. Average absenteeism increased for the week ending 2/20/10 for all schools but most markedly for high schools, a pattern seen during school breaks in the past.
See current surveillance and testing guidelines for 2009 H1N1 influenza.
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2010 Surveillance reports (PDF):
2009 Surveillance reports (PDF):
- Week 52, ending 1/02/10
- Week 51, ending 12/26/09
- Week 50, ending 12/19/09
- Week 49, ending 12/12/09
- Week 48, ending 12/05/09 (updated 12/10/09)
- Week 48, ending 12/05/09
- Week 47, ending 11/28/09 (updated 12/03/09)
- Week 47, ending 11/28/09
- Week 46, ending 11/21/09
- Week 45, ending 11/14/09 (updated 11/19/09)
- Week 45, ending 11/14/09
- Week 44, ending 11/07/09 (updated 11/13/09)
- Week 44, ending 11/07/09
- Week 43, ending 10/31/09 (updated 11/05/09)
- Week 43, ending 10/31/09
- Week 42, ending 10/24/09 (updated 10/29/09)
- Week 42, ending 10/24/09
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