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Washington 2009-2010 Flu Season

Re: Washington--Week 14 - No new deaths (total 98)

Re: Washington--Week 14 - No new deaths (total 98)

Week 14:

Washington State Summary:
? Influenza activity in Washington remains low.
? From September 19, 2009?April 10, 2010, the Washington State Department of Health received reports of 1403 hospitalized and 82 deceased patients with laboratory-confirmed influenza. Eight hospitalized patients with laboratory-confirmed influenza became ill in the past 4 weeks. Of these
patients, 3 reside west and 5 reside east of the Cascade Mountains.
? The proportion of outpatient visits for influenza-like illness (ILI) remains below the state baseline
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

Seattle and King County:
* Emergency department (ED) visits for influenza like illness (ILI) have held steady for four months, after declining from a peak in fall.
* No King County residents were hospitalized with laboratory-confirmed influenza in week 14. There were a total of three laboratory-confirmed influenza hospitalizations with onset of illness in March; all were 2009 H1N1.
* 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.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
* The percentage of rapid antigen tests positive for influenza is below the average proportion observed this time of year.
* One long-term care facility reported cases of influenza like illness in its facility in week 13. However, cultures of a subset of symptomatic residents were negative for influenza. This was the first report of influenza like illness in a long-term care facility received since early January. Since mid-October, 14 long-term care facilities have reported cases of influenza like illness in their facilities.
* School absenteeism has been low and stable in recent weeks, with the majority of schools reporting <10% of students absent. Note that many schools were closed for the week ending 4/3/10 and/or the week ending 4/10/10.
 
Re: Washington--Week 15 - No new deaths (total 98)

Re: Washington--Week 15 - No new deaths (total 98)

Week 15:

Summary:
• Influenza activity in Washington is very low.
• From September 19, 2009–April 17, 2010, the Washington State Department of Health received reports of 1402 hospitalized and 82 deceased patients with laboratory-confirmed influenza. Ten hospitalized patients with laboratory-confirmed influenza became ill in the past 4 weeks. Of these patients, 4 reside west and 6 reside east of the Cascade Mountains.
• During March 14–April 3 (weeks 11–13), 7 (1.1%) of the specimens tested by the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington were positive for influenza. Four of these specimens were 2009 influenza A (H1N1) viruses, 2 were influenza A viruses of unknown subtype and 1 was influenza B virus.
• The proportion of outpatient visits for influenza-like illness (ILI) remains below the state baseline
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

Seattle and King County
* Emergency department (ED) visits for influenza like illness (ILI) have held steady for over four months, after declining from a peak in fall.
* Two King County residents were hospitalized with laboratory-confirmed influenza in week 15; one was hospitalized with influenza A (not subtyped) and one was hospitalized with influenza B. There were a total of three laboratory-confirmed influenza hospitalizations with onset of illness in March; all were 2009 H1N1.
* 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.
* One long-term care facility reported cases of influenza like illness in its facility in week 13. However, cultures of a subset of symptomatic residents were negative for influenza. This was the first report of influenza like illness in a long-term care facility received since early January. Since mid-October, 14 long-term care facilities have reported cases of influenza like illness in their facilities.
* School absenteeism has been low and stable in recent weeks, with the majority of schools reporting <10% of students absent. Note that many schools were closed for the week ending 4/3/10 and/or the week ending 4/10/10.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
 
Re: Washington--Week 16 - One new deaths (total 99)

Re: Washington--Week 16 - One new deaths (total 99)

Week 16:

One new death (83 for season, 16 prior); total 99

Washington State
Influenza activity in Washington is very low.
? From September 19, 2009?April 24, 2010, the Washington State Department of Health received reports of 1403 hospitalized and 83 deceased patients with laboratory-confirmed influenza. Eight hospitalized patients with laboratory-confirmed influenza became ill in the past 4 weeks, including one patient who died. Of these patients, 3 reside west and 5 reside east of the Cascade Mountains.
? During March 28?April 17 (weeks 13?15), 7 (1.2%) of the specimens tested by the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington were positive for influenza. Six of these specimens were 2009 influenza A (H1N1) viruses and 1 was influenza A virus of unknown subtype.
? The proportion of outpatient visits for influenza-like illness (ILI) remains below the state baseline.
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

Seattle and King County
* Emergency department (ED) visits for influenza like illness (ILI) have held steady for over four months, after declining from a peak in fall.
* One King County resident was hospitalized with laboratory-confirmed 2009 H1N1 influenza in week 16. Thus far in April, there have been a total of 3 laboratory-confirmed influenza hospitalizations; one each for 2009 H1N1 influenza, influenza A (not sub-typed) and influenza B. There were a total of three laboratory-confirmed influenza hospitalizations with onset of illness in March; all were 2009 H1N1.
* 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.
* One long-term care facility reported cases of influenza like illness in its facility in week 13. However, cultures of a subset of symptomatic residents were negative for influenza. This was the first report of influenza like illness in a long-term care facility received since early January. Since mid-October, 14 long-term care facilities have reported cases of influenza like illness in their facilities.
* School absenteeism has been low and stable in recent weeks, with the majority of schools reporting <10% of students absent. Note that many schools were closed for the week ending 4/3/10 and/or the week ending 4/10/10.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
 
Re: Washington--Week 17 - No new deaths (total 99)

Re: Washington--Week 17 - No new deaths (total 99)

Week 17:

Washington State:
Summary:
? The Washington State Department of Health (DOH) detected no influenza activity in Washington during week 17.
? From September 19, 2009?May 1, 2010, DOH received reports of 1405 hospitalized and 83 deceased patients with laboratory-confirmed influenza. Four hospitalized patients with laboratory-confirmed influenza became ill in the past 4 weeks. Two of these patients reside east and two reside west of the Cascade Mountains.
? During April 4?May 1 (weeks 14?17), 2 (0.5%) of the specimens tested by the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington were positive for influenza. Both of these specimens were 2009 influenza A (H1N1) viruses.
? The proportion of outpatient visits for influenza-like illness (ILI) remains below the state baseline.
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

Seattle and King County:
* Emergency department (ED) visits for influenza like illness (ILI) have held steady for over four months, after declining from a peak in fall.
* No King County residents were hospitalized with laboratory-confirmed influenza in week 17. In April there were a total of 3 laboratory-confirmed influenza hospitalizations; one each for 2009 H1N1 influenza, influenza A (not sub-typed) and 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.
* One long-term care facility reported cases of influenza like illness in its facility in week 13. However, cultures of a subset of symptomatic residents were negative for influenza. This was the first report of influenza like illness in a long-term care facility received since early January. Since mid-October, 14 long-term care facilities have reported cases of influenza like illness in their facilities.
* School absenteeism has been low and stable in recent weeks, with the majority of schools reporting <10% of students absent. Note that many schools were closed for the week ending 4/3/10 and/or the week ending 4/10/10.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
 
Re: Washington--Week 18 - No new deaths (total 99)

Re: Washington--Week 18 - No new deaths (total 99)

Week 18:

State:
? The Washington State Department of Health (DOH) detected no influenza activity in Washington
during week 18.
? From September 19, 2009?May 8, 2010, DOH received reports of 1406 hospitalized and 83 deceased patients with laboratory-confirmed influenza. Four hospitalized patients with laboratory-confirmed influenza became ill in the past 4 weeks. Two of these patients reside east and two reside west of the Cascade Mountains.
? During April 4?May 1 (weeks 14?17), 2 (0.1%) of the specimens tested by the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington were positive for influenza. Both of these specimens were 2009 influenza A (H1N1) viruses.
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

Seattle and King County:
# Emergency department (ED) visits for influenza like illness (ILI) are at levels comparable to those observed in the beginning of September 2009, just prior to the surge in influenza-related ED visits during the fall outbreak.
# No King County residents were hospitalized with laboratory-confirmed influenza in week 18. In April there were a total of 3 laboratory-confirmed influenza hospitalizations; one each for 2009 H1N1 influenza, influenza A (not sub-typed) and 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.
# One long-term care facility reported cases of influenza like illness in its facility in week 13. However, cultures of a subset of symptomatic residents were negative for influenza. This was the first report of influenza like illness in a long-term care facility received since early January. Since mid-October, 14 long-term care facilities have reported cases of influenza like illness in their facilities.
# School absenteeism has been low and stable in recent weeks, with the majority of schools reporting <10% of students absent
? The proportion of outpatient visits for influenza-like illness (ILI) is very low.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
 
Re: Washington--Week 19 - No new deaths (total 99)

Re: Washington--Week 19 - No new deaths (total 99)

Week 19:

State:
Summary:
? The Washington State Department of Health (DOH) detected no influenza activity in Washington during week 19.
? From September 19, 2009?May 15, 2010, DOH received reports of 1406 hospitalized and 83 deceased patients with laboratory-confirmed influenza. Two hospitalized patients with laboratory confirmed influenza became ill in the past 4 weeks. Both of these patients reside east of the Cascade Mountains.
? During April 11?May 8 (weeks 15?18), 2 (0.4%) of the specimens tested by the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington were positive for influenza. Both of these specimens were 2009 influenza A (H1N1) viruses.
? The proportion of outpatient visits for influenza-like illness (ILI) is very low
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

Seattle and King County:
* Emergency department (ED) visits for influenza like illness (ILI) are at levels comparable to those observed in the beginning of September 2009, just prior to the surge in influenza-related ED visits during the fall outbreak.
* Public Health has not received any reports of laboratory-confirmed influenza hospitalizations with onset after the week ending 4/17/10. In April there were a total of 3 laboratory-confirmed influenza hospitalizations; one each for 2009 H1N1 influenza, influenza A (not sub-typed) and 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 in the same range as 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.
* One long-term care facility reported cases of influenza like illness in its facility in week 13. However, cultures of a subset of symptomatic residents were negative for influenza. This was the first report of influenza like illness in a long-term care facility received since early January. Since mid-October, 14 long-term care facilities have reported cases of influenza like illness in their facilities.
* School absenteeism has been low and stable in recent weeks, with the majority of schools reporting <10% of students absent.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
 
Re: Washington-Week 20-No new deaths (total 99)FINAL REPORT

Re: Washington-Week 20-No new deaths (total 99)FINAL REPORT

Week 20: No Activity FINAL REPORT

State:
The Washington State Department of Health (DOH) detected no influenza activity in Washington during week 20.
? From September 19, 2009?May 15, 2010, DOH received reports of 1406 hospitalized and 83 deceased patients with laboratory-confirmed influenza.
? During April 18?May 15 (weeks 16?19), 0 (0%) of the specimens tested by the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington were positive for influenza.
? The proportion of outpatient visits for influenza-like illness (ILI) is very low.
? This is the last weekly Influenza Update for the season.
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

Seattle and King County:
* Emergency department (ED) visits for influenza like illness (ILI) peaked unexpectedly in May 2009, then fell over the summer months and began to rise again in September 2009, reaching a peak in November 2009. Currently, ED visits for ILI are at levels comparable to those observed in the beginning of September 2009, just prior to the surge in influenza-related ED visits during the fall outbreak.
* Public Health first received reports of King County residents hospitalized with laboratory-confirmed 2009 H1N1 influenza in April 2009. Reports of laboratory-confirmed influenza hospitalizations were bimodal, with a local peak in May 2009, and a second peak in November 2009. Public Health has not received any reports of laboratory-confirmed influenza hospitalizations with onset after the week ending 4/17/10.
* A total of 25 influenza deaths have occurred among King County residents since the beginning of the 2009 H1N1 outbreak. Twenty two of these deaths were associated with 2009 H1N1, one was associated with an influenza A virus that was not subtyped, and one was associated with an influenza B virus. 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 was higher than typical in spring and fall 2009, and is currently in the same range as the average proportion observed at this time of year.
* The percentage of rapid antigen tests positive for influenza was higher than typical in spring and fall 2009, and is currently in the same range as the average proportion observed this time of year.
* Since mid-October, 14 long-term care facilities have reported cases of influenza like illness in their facilities. No reports of influenza like illness have been received from long-term care facilities since March 2010.
* School absenteeism has overall been low and stable over the course of the 2009-2010 school year. Surrounding school breaks, there were transient increases in absenteeism. Currently, school absenteeism is low and stable, with the majority of schools reporting <10% of students absent.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
 
Re: Washington: Weeks 25-29, 2010

Re: Washington: Weeks 25-29, 2010

Summary:
? The Department of Health (DOH) has received rare sporadic reports of positive influenza tests over the past month.
? During June 20?July 17 (weeks 25?28), 2 specimens tested by the World Health Organization/ National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington were positive for influenza. Both were 2009 H1N1 influenza A virus.
? The proportion of outpatient and emergency room visits for influenza-like illness (ILI) is very low.

No influenza-associated pediatric deaths were reported in Washington during weeks 26?29.

During September 18, 2009 through May 15, 2010, the Department of Health (DOH) performed surveillance for laboratory-confirmed influenza hospitalizations and deaths. During this time, DOH received reports of 1406 hospitalized and 83 deceased patients with laboratory-confirmed influenza.
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf
 
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