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Influenza Update—Week 16

May 1, 2019

Data are preliminary.

Pierce County

Influenza activity is low.

Hospitalizations

  • This season, 660 Pierce County residents have been hospitalized with influenza.
  • The median age of hospitalized patients is 64 years (range 9 days to 97 years).
  • The most common premorbid conditions among hospitalized adults are obesity (46%), diabetes (32%) and chronic obstructive pulmonary disease (28%).

Deaths

  • Since Oct. 22, 2018, we identified 42 people who died with influenza.
  • The median age of those who died is 73 years (range 36 to 97 years).

Viruses

  • Influenza A continues to predominate.
  • 95% of patients hospitalized with influenza tested positive for influenza A and 5% tested positive for influenza B.
  • Of the 181 subtyped viruses, 56% were influenza A H3N2.
  • 1 patient tested positive for both influenza A H3N2 and influenza A H1N1.

Influenza-like illness

  • Visits to primary care, urgent care and emergency departments (EDs) for influenza-like illness (ILI) are low.

Graph of influenza data. For more information, call (253) 798-6410.

 

 Graph of influenza data. For more information, call (253) 798-6410.

 

 Graph of influenza data. For more information, call (253) 798-6410.

Graph of influenza data. For more information, call (253) 798-6410.

Influenza deaths by age group, 2018-2019 influenza season, weeks 40 through 16

AGE

Deaths

0 to 4 years

0

5 to 17 years

0

18 to 49 years

4

50 to 64 years

9

65 years and older

29

Total

42

Graph of influenza data. For more information, call (253) 798-6410.

 

Graph of influenza data. For more information, call (253) 798-6410.

Washington

Influenza activity is decreasing.

Deaths

  • This season, Washington State Department of Health received notification of 204 people who died with influenza.

Viruses

  • During week 16, 6.2% of commercial lab specimens tested positive for influenza.

Influenza-like illness

  • The proportion of outpatient visits for ILI is below baseline.
  • Washington ILI activity is minimal.

Graph of influenza data. For more information, call (253) 798-6410.

Graph of influenza data. For more information, call (253) 798-6410.

United States

Influenza activity is decreasing.

Hospitalizations

  • The most common premorbid conditions among hospitalized adults are cardiovascular disease, metabolic disorder and obesity.

Deaths

  • This season, Centers for Disease Control and Prevention (CDC) received notification of 96 children who died with influenza.
  • The proportion of deaths caused by pneumonia or influenza is below the epidemic threshold.

Viruses

  • During week 16, 76.7% of viruses subtyped by public health labs were influenza A H3N2.
  • Influenza A H3N2 predominates in all 10 Health and Human Services (HHS) Regions.
  • The proportion of influenza B viruses detected remains low.

Graph of influenza data. For more information, call (253) 798-6410.

 

 Graph of influenza data. For more information, call (253) 798-6410.

 Graph of influenza data. For more information, call (253) 798-6410.

Influenza hospitalizations per 100,000 population, 2018-2019 influenza season, weeks 40 through 16

Age

Pierce County

United States

0 to 4 years

51.7

73.1

5 to 17 years

14.9

20.7

18 to 49 years

34.7

25.8

50 to 64 years

92.7

79.7

65 years and older

264.1

214.1

Total

76.1

64.2

 

Graph of influenza data. For more information, call (253) 798-6410.

Comments

Influenza activity in Pierce County is low, but hospitalizations and deaths continue to occur. Three people died with influenza during week 16.

This season, influenza A H1N1 predominated through January and hospitalizations were relatively low. In February, influenza A H3N2 became more common and hospitalizations began to increase. Influenza A H3N2 became the predominant virus throughout the country in late February. Influenza A H3N2 tends to affect older adults more severely than influenza A H1N1.

Data for interim estimates of 2018-2019 seasonal influenza vaccine effectiveness were collected while influenza A H1N1 predominated. At that time, the vaccine was estimated to be 47% effective against medically-attended, laboratory-confirmed influenza.

Genetic diversity among circulating influenza A H3N2 viruses is extensive. More than half of influenza A H3N2 viruses tested were poorly inhibited by antibodies against the influenza A H3N2 component of the 2018-19 seasonal influenza vaccine. Future vaccine effectiveness estimates will likely be lower than the interim estimate.

References

Centers for Disease Control and Prevention. (2019). Interim estimates of 2018-2019 seasonal influenza vaccine effectiveness—United States, February 2019. Morbidity and Mortality Weekly Report, 68(6), 135-139. Retrieved April 30, 2019 from www.cdc.gov/mmwr/volumes/68/wr/mm6806a2.htm.

Centers for Disease Control and Prevention. (2019). Weekly U.S. influenza surveillance report. 2018-2019 influenza season week 16 ending April 20, 2019. Retrieved April 26, 2019 from www.cdc.gov/flu/weekly.

Washington State Department of Health. (2019). Washington State influenza update. Week 16: April 14, 2019 – April 20, 2019. Retrieved April 26, 2019 from www.doh.wa.gov/DataandStatisticalReports/DiseasesandChronicConditions/CommunicableDiseaseSurveillanceData/InfluenzaSurveillanceData.

 

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