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Washington 2010-2011 Season: Weeks 40-36

M

Missouriwatcher

Editor, Senior Moderator
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
 
Re: Washington 2010-2011 Season: Weeks 40-44

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

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

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

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

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

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

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

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

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

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%) 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
 
Re: Washington 2010-2011 Season: Weeks 40-2

Re: Washington 2010-2011 Season: Weeks 40-2

Week 2: Local Activity
• During week 2 (1/9/11–1/15/11), influenza activity in Washington remained low overall. Influenza activity
has increased in Washington over the past several weeks.
• During weeks 1–2 (1/2/11–1/15/11), 40 (8.3%) 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 21 influenza A (H3) viruses,
7 2009 H1N1 viruses, 10 unsubtyped influenza A viruses, and 2 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 decreased slightly.
• There were no laboratory-confirmed influenza deaths reported to the Washington State Department of
Health during week 2.
http://www.doh.wa.gov/notify/nc/influenza.htm

One death reported in Seattle & King County. The death was in a middle-aged man with pre-existing health conditions with lab-confirmed AH3N2.
41.2% positive specimens
• Two long-term care facilities reported a cluster
of respiratory illness in week 3; these were the
first reports received since September 2010.
Confirmatory laboratory testing is pending.

•The proportion of deaths attributable to
pneumonia and influenza was not available for
week 2. The epidemic threshold is 7.8%.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
 
Re: Washington 2010-2011 Season: Weeks 40-3

Re: Washington 2010-2011 Season: Weeks 40-3

Week 3:
NOTE: This report indicates no new lab confirmed deaths. Last week Seattle & King County listed a death. Their week 3 is not out yet, if there is a correction.

ILI: 0.6% (below baseline)
ED ILI: 1.1% (Western); 2.0% (Eastern)
9.1% positive specimens
http://www.doh.wa.gov/ehsphl/Epidemiology/CD/fluupdate.pdf
http://www.doh.wa.gov/notify/nc/influenza.htm

Seattle & King County:
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx
 
Re: Washington 2010-2011 Season: Weeks 40-4 (One New Death, Total 4)

Re: Washington 2010-2011 Season: Weeks 40-4 (One New Death, Total 4)

Week 4:
1 new death (middle-aged man); total 4 NOTE: Reported in Seattle and King County report only NOTE: This death is now showing up in state report week 7.

Washington State: (week 4)
ILI: 1.7%
96% were influenza A and 4% were influenza B. Of the subtyped influenza A specimens, 61% were influenza A (H3) viruses and 39% were 2009 H1N1 viruses.
P&I deaths: 7.3%
http://www.doh.wa.gov/ehsphl/Epidemiology/CD/fluupdate.pdf


Seattle and King County: (week 3)

One laboratory-confirmed influenza death occurred in week 3; the death was in a middle-aged man with pre-existing conditions who died outside King County with lab-confirmed influenza A (not subtyped). In week 2 a middle-aged man with pre-existing health conditions died with lab-confirmed AH3N2.

60.0% specimens submitted by the outpatient sentinel surveillance system were positive for influenza (two pandemic AH1N1 and one flu B)
10.6% rapid positive
P&I deaths: 4%
• The UW Virology Laboratory had twelve positive tests for influenza (four pandemic AH1N1, six AH3N2 and two influenza A not subtyped).
• Two long-term care facilities (LTCFs) reported a cluster of respiratory illness in week 3; both facilities had laboratory-confirmed influenza A identified in one or more residents.

(Week 4)
38.5% positive for influenza by outpatient surveillance
School absenteeism remains low
P&I deaths: 4.2%
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx

Whatcom County Health Dept: (week 4)
During week 2011-04, Influenza activity in Whatcom County was low. There were no lab confirmed influenza related hospitalizations. The number of influenza tests performed at PeaceHealth Laboratories was similiar to the previous week with no positive influenza tests reported. One outpatient clinic reported some (ILI) visits but neither clinic had positive influenza tests for the week. There were no reports of influenza outbreaks from long term care facilities. Schools reported no elevated absenteeism due to illness. There were no new reportable Influenza cases of Whatcom residents with a total of one case this season.
http://www.co.whatcom.wa.us/health/flu/index.jsp
 
Re: Washington 2010-2011 Season: Weeks 40-4 (One New Death, Total 4)

Re: Washington 2010-2011 Season: Weeks 40-4 (One New Death, Total 4)

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

Here is the Week 4 isolates chart for Washington:

Week 4 WA Isolates.png
 
Re: Washington 2010-2011 Season: Weeks 40-5 (One New Death, Total 5)

Re: Washington 2010-2011 Season: Weeks 40-5 (One New Death, Total 5)

Week 5:
WA State:
One new death; total 5 From WA State report (week 5), deaths have occurred weeks 47, 49, 52 and 3. I do not believe the one reported in Seattle and King County for week 4 has been counted in WA report, but I included it in total.

ILI: 4.2% (baseline 3.2%)

• The proportion of outpatient visits for influenza-like illness (ILI) was above the state baseline while the proportion of emergency room visits for ILI was just below the baseline.
• There were two laboratory-confirmed influenza deaths reported to the Washington State Department of Health during week 5.
• During weeks 4–5 (1/23/11–2/5/11), 56 (8.9%) specimens tested by the World Health Organization/National Respiratory and Enteric Virus Surveillance System (WHO/NREVSS) collaborating laboratories in Washington were positive for influenza. Of these specimens, 98% were influenza A and 2% were influenza B. Of the subtyped influenza A specimens, 48% were influenza A (H3) viruses and 52% were2009 H1N1 viruses.

Since October 3, 2010, 13 adults and 5 children hospitalized with laboratory confirmed influenza have been reported among Spokane County residents. Two were infected with influenza A(H3) virus, 14 were infected with influenza A viruses of unknown subtype and 2 were infected with influenza B viruses.
http://www.doh.wa.gov/EHSPHL/Epidemiology/CD/fluupdate.pdf

Seattle and King County:
Influenza continued to circulate in King County during week 5, but at levels lower than observed during past season peaks.
http://www.kingcounty.gov/healthservices/health/communicable/immunization/fluactivity.aspx

Whatcom County:
During week 2011-05, Influenza activity in Whatcom County increased. Complaints of respiratory illness presenting at the emergency department increased by the end of the week.
http://www.co.whatcom.wa.us/health/flu/pdf/Whatcominflurpt_wk_2011_5.pdf
http://www.co.whatcom.wa.us/health/flu/index.jsp
 
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