Week 17/2021 (26 April-02 May 2021)
· Influenza activity remains at or below interseasonal level.
· Display of data will be updated on a weekly basis until the end of the regular influenza season timing (week 20 data) and on a monthly basis during the interseason.
Information on countries and areas reporting on intensity of activity and geographic spread this week can be seen in respective figures below.
- Assessment of the intensity of activity indicator includes consideration of ILI or ARI rates. These ILI or ARI rates might be driven by respiratory infections other than influenza, including SARS-CoV-2, leading to observed increases in the absence of influenza virus detections
- Assessment of intensity and geographic spread indicators includes consideration of sentinel and non-sentinel influenza virus detection data. Non-sentinel influenza virus detections, often higher, might translate into reporting of elevated geographic spread even in the absence of sentinel detections.
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