Influenza Update—Week 19
May 22, 2019
Data are preliminary.
Influenza continues to circulate but activity is low.
- This season, 671 Pierce County residents have been hospitalized with influenza.
- The median age of hospitalized patients is 64 years (range 9 days to 100 years).
- The most common premorbid conditions among hospitalized adults are obesity, diabetes and chronic obstructive pulmonary disease.
- 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).
- 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.
- 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 183 subtyped viruses, 56% were influenza A H3N2.
- 1 patient tested positive for both influenza A H3N2 and influenza A H1N1.
- Visits to primary care, urgent care and emergency departments (EDs) for influenza-like illness (ILI) are low.
Influenza activity is low.
- This season, Washington State Department of Health received notification of 222 people who died with influenza.
- During week 19, 1.8% of commercial lab specimens tested positive for influenza.
- The proportion of outpatient visits for ILI is below baseline.
- Washington ILI activity is minimal.
Influenza activity is decreasing.
- The most common premorbid conditions among hospitalized adults are cardiovascular disease, metabolic disorder and obesity.
- This season, CDC received notification of 109 children who died with influenza.
- The proportion of deaths caused by pneumonia or influenza is below the epidemic threshold.
- During week 19, 3.7% of commercial lab specimens tested positive for influenza.
- 56.3% of influenza A viruses subtyped by public health laboratories were H3N2.
Centers for Disease Control and Prevention. (2019). Weekly U.S. influenza surveillance report. 2018-2019 influenza season week 19 ending May 11, 2019. Retrieved May 20, 2019 from www.cdc.gov/flu/weekly.
Washington State Department of Health. (2019). Washington State influenza update. Week 19: May 5, 2019 – May 11, 2019. Retrieved May 20, 2019 from www.doh.wa.gov/DataandStatisticalReports/DiseasesandChronicConditions/CommunicableDiseaseSurveillanceData/InfluenzaSurveillanceData.
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