Washington 2010-2011 Season: Weeks 40-36

[Missouriwatcher]

Week 40:
? Influenza activity in Washington is low.
? Last week, the Department of Health (DOH) received reports of sporadic influenza B infections.
? Since 7/25/2010, the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington detected 6 positive influenza specimens; 1 was influenza B, 3 were influenza A (2009 H1N1) and 2 were influenza A (H3) viruses.
? The proportion of outpatient and emergency room visits for influenza-like illness (ILI) is very low.

Five large commercial laboratories in Washington report the number of influenza positive results obtained each week to DOH through PHRED. During CDC week 40 (10/3?10/9), these five labs reported one positive influenza B specimen. During the peak week of the 2009 H1N1 pandemic, there were 251 positive specimens reported in a single week.

Up to 20 laboratories and clinics located in 6 counties in Washington report the total number of influenza tests performed and the total number positive for influenza A and B each week through PHRAID. During CDC Week 40 (10/3?10/9), 3 facilities reported 5 positive influenza B specimens and 1 influenza of unknown type out of 57 influenza tests conducted.

During CDC Week 39, 16 (6.0%) of 266 deaths in Seattle, Spokane and Tacoma were due to pneumonia or influenza (P&I).

http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

http://www.doh.wa.gov/notify/nc/influenza.htm

Seattle and King County Info:

http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-41

Week 41: very low activity
ILI: 1.3%
No specimens tested positive out of 47 submitted
During CDC Week 41, 20 (6.7%) of 299 deaths in Seattle, Spokane and Tacoma were due to pneumonia or influenza (P&I).

http://www.doh.wa.gov/notify/nc/influenza.htm

Seattle and King County Info:

http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-42

Week 42: very low activity
ILI: 1.3%
No specimens tested positive
During CDC Week 42, 16 (5.4%) of 297 deaths in Seattle, Spokane and Tacoma were due to pneumonia or influenza (P&I).

http://www.doh.wa.gov/notify/nc/influenza.htm

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-43

Week 43: low activity
ILI: 1.5%
0.6% specimens tested positive (A/H3, A, B)

http://www.doh.wa.gov/notify/nc/influenza.htm

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-44

Week 44: Sporadic
• Influenza activity remains low in Washington.
• During weeks 43–44 (10/24/2010–11/6/2010), 1 (0.3&#37 specimen tested by the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington was positive for influenza. This specimen was an influenza A (H3) virus.
• No laboratory-confirmed flu deaths have been reported to the Washington State Department of Health since April 2010.
• The proportion of outpatient and emergency room visits for influenza-like illness (ILI) is low.

http://www.doh.wa.gov/notify/nc/influenza.htm

Seattle and King County Info:

http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-45

Week 45
? Influenza activity remains low in Washington.
? During weeks 44?45 (10/31/2010?11/13/2010), 3 (1%) 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 positive specimens included 2 influenza A H3 viruses and 1 influenza B virus.
? No laboratory-confirmed flu deaths have been reported to the Washington State Department of Health since April 2010.
? The proportion of outpatient and emergency room visits for influenza-like illness (ILI) is low.

http://www.doh.wa.gov/notify/nc/influenza.htm

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-46

? Influenza activity remains low in Washington.
? During weeks 45?46 (11/7/2010?11/20/2010), 6 (1.9%) 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 positive specimens included 2 influenza A H3
viruses and 4 unsubtyped influenza A viruses.
? No laboratory-confirmed flu deaths have been reported to the Washington State Department of Health since April 2010.
? ILI: 1.3%

http://www.doh.wa.gov/notify/nc/influenza.htm

Seattle and King County (week 45):
? Ten specimens were submitted by the
outpatient sentinel surveillance system,
none positive.
?Two hospitalized cases of PCR confirmed
influenza A were reported by a local
hospital

http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-47 (1 New Death)

Week 47:
Washington State:
1 death reported (Influenza B)

Influenza activity in Washington remained low during week 47.
During weeks 46–47 (11/14/2010–11/27/2010), 12 (3.9&#37 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 positive specimens included 8 influenza A (H3) viruses, 1 influenza A (2009 H1N1) virus, and 3 unsubtyped influenza A viruses.

The proportion of outpatient visits for influenza-like illness (ILI) increased over the past 2 weeks but remained below the Washington baseline. The proportion of emergency room visits for ILI remained stable during week 47.

http://www.doh.wa.gov/notify/nc/influenza.htm

Seattle and King County: (week 46)
No hospitalizations
No positive specimens
1.9% rapid antigen tests reported by 5 hospital laboratories were positive for influenza B.

http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx

[sharon sanders]

Re: Washington 2010-2011 Season: Weeks 40-47 (1 New Death)

Missouriwatcher thank you for the analysis and the effort to break down these flu reports by state.

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-48

Week 48:
• Influenza activity in Washington remained low during week 48.
• During weeks 47–48 (11/21/2010–12/4/2010), 12 (3.8&#37 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 positive specimens included 7 influenza A
(H3) viruses, 1 influenza A (2009 H1N1) virus, and 4 unsubtyped influenza A viruses.
• No laboratory-confirmed influenza deaths were reported to the Washington State Department of Health
during week 48.
• The proportion of outpatient and emergency room visits for influenza-like illness (ILI) remained below the
Washington baseline.

http://www.doh.wa.gov/notify/nc/influenza.htm

Seattle and King County
Percent positive influenza: 12.5%
No deaths reported
No hospitalized cases of influenza were reported. In week 45, two hospitalized cases of influenza B PCR confirmed influenza A were reported by a local hospital.

http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-49 (One New Death)

Week 49:
1 new death (age-group 50-64); total 2

• During week 49 (12/5/10–12/11/2101), influenza activity in Washington remained low overall but increased in South Central Washington.
• During weeks 48–49 (11/28/2010–12/11/2010), 7 (1.9&#37 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 positive specimens included 4 influenza A(H3) viruses and 3 unsubtyped influenza A viruses.
• The proportion of outpatient and emergency room visits for influenza-like illness (ILI) remained below the Washington baseline.

http://www.doh.wa.gov/notify/nc/influenza.htm

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-50

Week 50:
No new deaths
ILI: 1%

http://www.doh.wa.gov/notify/nc/influenza.htm

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-51

? During week 51 (12/19/10?12/25/10), influenza activity was low throughout the state with the exception
of South Central Washington where influenza activity was elevated. Influenza activity in South Central
Washington has increased over the past few weeks.
? 2.1% 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 positive specimens included 4 influenza A (H3) viruses, 2
unsubtyped influenza A, and 2 influenza B viruses.
? There were no laboratory-confirmed influenza deaths reported to the Washington State Department of
Health during week 51.
? The proportion of outpatient and emergency room visits for influenza-like illness (ILI) remained low.

http://www.doh.wa.gov/notify/nc/influenza.htm

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-52

Summary:
• During week 52 (12/26/10–1/1/11), influenza activity was low throughout the state with the exception of
South Central Washington where influenza activity continued to be elevated.
• 4.4% 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 positive specimens included 5 influenza A (H3) viruses, 2
2009 H1N1 viruses, 4 unsubtyped influenza A viruses, and 7 influenza B viruses.
• There were no laboratory-confirmed influenza deaths reported to the Washington State Department of
Health during week 52.
• The proportion of outpatient and emergency room visits for influenza-like illness (ILI) remained low
overall.

http://www.doh.wa.gov/notify/nc/influenza.htm

[Missouriwatcher]

Re: Washington 2010-2011 Season: Weeks 40-1

Week 1: Local Activity
• During week 1 (1/2/11–1/8/11), influenza activity in Washington remained low overall, but increased
slightly. Influenza activity remained elevated in South Central Washington.
• During weeks 52–1 (12/26/10–1/8/11), 26 (6.1&#37 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 positive specimens included 15 influenza A (H3) viruses,
5 2009 H1N1 viruses, 3 unsubtyped influenza A viruses, and 3 influenza B viruses.
• The proportion of outpatient visits for influenza-like illness (ILI) remained below the Washington baseline.
The proportion of emergency room visits for ILI increased slightly.
• There were no laboratory-confirmed influenza deaths reported to the Washington State Department of
Health during week 1.

http://www.doh.wa.gov/notify/nc/influenza.htm

During week 1, Seattle and King County reported 23% positive specimens for influenza; weeks 51, 52 were 0%. (Influenza A)

http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx