Washington State Influenza Update

Washington State Influenza Update

Weeks 32-36 Aug 4 ? Sep 14, 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

241

2 children 239 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

Weeks 32-36:August 4, 2019-September 14, 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 one 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 37, 0.4 percent of visits among Influenza-like illness Network participants were for influenza-like illness, below the baseline of 1.1 percent.

? During week 37, 1.6 percent of specimens tested by WHO/NREVSS collaborating laboratories in Washington were positive for influenza.

? Influenza A and Influenza B were reported during week 37.

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)

33

0

34

0

35

0

36

0

A (2009 H1N1)

0 0 1 0

A (H3N2)

1 1 3 0

A (Unable to Subtype) 0 0 0 0

A (Subtyping not performed)

1 1 3 1

B BYam BVic

10

0

00

0

00

0

00

0

Total Tested

220 206 238 63

% Flu Positive

1.4 1.0 2.9 1.6

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 37, 4 sentinel providers in Washington reported data through the U.S. Outpatient Influenza-like Illness Surveillance Network Surveillance Network (ILINet). Of 3390 visits reported, 13 (0.4%) 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 34 35 36 37

Sentinel Providers

8 8 8 4

Age 04 6 0 0 4

Age 524 2 0 1 3

Age 2549 5 1 4 3

Age 5064 3 3 2 0

Over 64 0 0 1 3

Total ILI 16 4 8 13

Total Patients

3,358 3,237 3,537 3,390

Percent ILI 0.5 0.1 0.2 0.4

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 37

4

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