Washington State Influenza Update
Washington State Influenza Update
Week 31 July 28 ? Aug 03, 2019
Washington State Department of Health, Communicable Disease Epidemiology Quick facts are below. See full report on pages 1-9 for details.
Flu activity in Washington is currently
Low
Take Me To:
Strains Trends Other viruses Deaths
page 1 page 3 page 7 page 8
Number of reported labconfirmed deaths
2018-2019 season to date
240
2 children 238 adults
How do you stop the spread of flu?
Get vaccinated! After getting vaccinated, also:
Most common type this week
A&B
More information:
Learn about flu and flu activity in Washington:
National flu report from the CDC Washington flu resources for providers Read detailed Washington weekly flu report
following this page.
Find Washington flu and flu vaccine information at .
DOH 420-100
If you have a disability or need this document in another format, call 1-800-525-0127 (TTY/TDD 7-1-1).
Washington State Influenza Update
Week 31:July 28, 2019-August 3, 2019
Washington State Department of Health, Communicable Disease Epidemiology
Please note all data are preliminary and may change as data are updated
State Summary: Flu activity is low
? Two hundred and forty lab-confirmed influenza deaths have been reported for the 2018-2019 season to date. ? One hundred and forty influenza-like illness outbreaks in long term care facilities have been reported for the
2018-2019 season to date. ? During week 31, 0.2 percent of visits among Influenza-like illness Network participants were for influenza-like
illness, below the baseline of 1.1 percent. ? During week 31, 2.3 percent of specimens tested by WHO/NREVSS collaborating laboratories in Washington
were positive for influenza. ? Influenza A and Influenza B were reported during week 31.
Influenza Laboratory Surveillance Data
Laboratory Data: World Health Organization (WHO) & National Respiratory and Enteric Virus Surveillance System (NREVSS) Data Reported to CDC
For the 2018-2019 influenza season, CDC has generated separate graphs of data reported to CDC by public health laboratories (Figure 1) and commercial laboratories (Figure 2). Table 1 combines the data from the public health and commercial laboratories.
Table 1: WA Influenza Specimens Reported to CDC, Public Health Laboratories and Commercial Laboratories
A
Week (H1)
28
0
29
0
30
0
31
0
A (2009 H1N1)
0 1 0 0
A (H3N2)
0 1 0 2
A (Unable to Subtype) 0 0 0 0
A (Subtyping not performed)
5 3 3 0
B BYam BVic
10
0
00
0
00
0
10
0
Total Tested
300 290 229 128
% Flu Positive
2.0 1.7 1.3 2.3
Figure 1: Influenza Positive Tests Reported to CDC, WA Public Health Laboratories
1
Figure 2: Influenza Positive Tests Reported to CDC, WA Commercial Laboratories 2
Outpatient Influenza-like Illness Surveillance
Outpatient Influenza-like Illness Surveillance Network (ILINet) Data ILI is defined as fever (temp 100?F/37.8?C or higher) plus cough and/or sore throat. During week 31, 19 sentinel providers in Washington reported data through the U.S. Outpatient Influenza-like Illness Surveillance Network Surveillance Network (ILINet). Of 3603 visits reported, 7 (0.2%) were due to ILI, below the baseline of 1.1%. Note that for this figure the baseline is determined by calculating the mean percentage of patient visits for ILI during non-influenza weeks for the previous three seasons and adding two standard deviations. A noninfluenza week is defined as periods of two or more consecutive weeks in which each week accounted for less than 2% of the season's total number of specimens that tested positive for influenza in public health laboratories. See
Figure 3: Percentage of ILI Visits Reported by Sentinel Providers, Washington, 2017-2019
Table 2: Number of ILI Visits Reported by Sentinel Providers by Age Group, Washington
Week 28 29 30 31
Sentinel Providers
20 20 19 19
Age 04 3 2 3 2
Age 524 0 3 1 2
Age 2549 5 1 5 1
Age 5064 2 1 2 2
Over 64 3 3 2 0
Total ILI 13 10 13 7
Total Patients
3,674 3,773 3,573 3,603
Percent ILI 0.4 0.3 0.4 0.2
3
Influenza Hospitalization Data
Reported Laboratory-Confirmed Influenza Hospitalizations (Spokane County Only) Spokane Regional Health District requires hospitals to report laboratory-confirmed influenza-associated hospitalizations. 474 lab-confirmed influenza hospitalizations have been reported since October 2018 (463 influenza A and 11 influenza B). Figure 4: Spokane Lab-Confirmed Influenza Hospitalizations by Month of Admission
Reported Laboratory-Confirmed Influenza Hospitalizations (Snohomish County Only) Snohomish Health District requires hospitals in Snohomish County to report laboratory-confirmed influenzaassociated hospitalizations to the health district. See figure below, courtesy of Snohomish Health District. Figure 5: Snohomish County Influenza Hospitalizations by Season 2013-CDC Week 17
Last Updated: 4/27/2019 4
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