Influenza Season Week 19

23 05 2009

2008-2009 Influenza Season Week 19 ending May 16, 2009

Seasonal Influenza Report

Week 19 Seasonal Influenza Report

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View Week 19 Chart Data

During week 19, seasonal influenza A (H1), A (H3), and B viruses continue to co-circulate with novel influenza A (H1N1). Approximately 73% of all influenza viruses being reported to CDC are novel influenza A (H1N1) viruses.

The increase in the percentage of specimens testing positive for influenza by WHO and NREVSS collaborating laboratories may be due in part to changes in testing practices by healthcare providers, triaging of specimens by public health laboratories, an increase in the number of specimens collected from outbreaks, and other factors.




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