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Influenza Update—Week 15

April 24, 2019

Data are preliminary.

Pierce County

Influenza activity is decreasing.

Hospitalizations

  • This season, 654 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, diabetes and chronic obstructive pulmonary disease.

Deaths

  • Since Oct. 22, 2018, we identified 38 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 179 subtyped viruses, 55% 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 decreasing.

Deaths

  • This season, Washington Department of Health received notification of 187 people who died with influenza.

Viruses

  • During week 15, 9.9% 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.

United States

Influenza activity is decreasing but remains elevated.

Deaths

  • This season, CDC received notification of 91 children who died with influenza.
  • The proportion of deaths caused by pneumonia or influenza is below the epidemic threshold.

Viruses

  • During week 15, 75.4% 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 baseline in 7 of 10 HHS Regions.

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 15

Age

Pierce County

United States

0 to 4 years

51.7

71.0

5 to 17 years

14.9

20.4

18 to 49 years

34.1

25.2

50 to 64 years

91.0

77.8

65 years and older

261.6

206.5

Total

75.2

62.3

References

Centers for Disease Control and Prevention. (2019). Weekly United States influenza surveillance report. 2018-2019 influenza season week 15 ending April 13, 2019. Retrieved April 19, 2019 from www.cdc.gov/flu/weekly.

Washington Department of Health. (2019). Washington influenza update. Week 15: April 7-13, 2019. Retrieved April 19, 2019 from www.doh.wa.gov/DataandStatisticalReports/DiseasesandChronicConditions/CommunicableDiseaseSurveillanceData/InfluenzaSurveillanceData.

 

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