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Influenza Update—Week 14

April 17, 2019

Data are preliminary.

Pierce County

Influenza activity is decreasing but remains elevated.

Hospitalizations

  • This season, 643 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 (47%), diabetes (33%) and chronic obstructive pulmonary disease (28%).

Deaths

  • Since Oct. 22, 2018, we identified 36 people who died with influenza.
  • The median age of those who died is 73 years (range 36 to 97 years).
  • Most had at least 1 premorbid condition that increases the risk of influenza complications.
  • 5 had no risk factor for influenza complications other than age greater than 65 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 177 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 decreasing.

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.

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.

Washington

Influenza activity is widespread and elevated but decreasing.

Deaths

  • This season, Washington Department of Health received notification of 176 people who died with influenza.

Viruses

  • During week 14, 18.1% of commercial lab specimens tested positive for influenza.

Influenza-like illness

  • The proportion of outpatient visits for ILI is above baseline.
  • Washington ILI activity is low.

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 decreased during week 14 but remains elevated.

Deaths

  • This season, CDC received notification of 86 children who died with influenza.
  • The proportion of deaths caused by pneumonia or influenza is below the epidemic threshold.

Viruses

  • During week 14, 76.8% 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.

Influenza-like illness

  • The proportion of outpatient visits for ILI is at or above HHS Regional baselines throughout the country.

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 14

Age

Pierce County

United States

0 to 4 years

51.7

69.1

5 to 17 years

13.5

19.8

18 to 49 years

34.1

24.6

50 to 64 years

89.8

75.5

65 years and older

249.1

195.9

Total

73.3

59.9

 

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

Comments

This season has the highest number of influenza hospitalizations and the second highest number of influenza deaths than any previous season. Improved reporting and surveillance may contribute to these increased numbers.

Pierce County influenza hospitalizations and deaths, by season

Influenza Season

Hospitalizations

Deaths

2013-2014

145

10

2014-2015

379

25

2015-2016

242

15

2016-2017

631

50

2017-2018

548

31

2018-2019 (preliminary)

643

36

 

Influenza hospitalizations per 100,00 population, by season

Influenza Season

Pierce County

United States

2013-2014

18.0

35.1

2014-2015

46.6

64.1

2015-2016

29.4

31.4

2016-2017

75.8

62.0

2017-2018

64.8

102.9

2018-2019 (preliminary)

73.3

59.9

 

References

Centers for Disease Control and Prevention. (2019). Weekly United States influenza surveillance report. 2018-2019 influenza season week 14 ending April 6, 2019. Retrieved April 12, 2019 from www.cdc.gov/flu/weekly.

Washington Department of Health. (2019). Washington influenza update. Week 14: March 31-April 6, 2019. Retrieved April 12, 2019 from www.doh.wa.gov/DataandStatisticalReports/DiseasesandChronicConditions/CommunicableDiseaseSurveillanceData/InfluenzaSurveillanceData.

 

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