Week 18/2022 (02 May - 08 May 2022)
- 13 of 40 countries across the Region reported widespread influenza activity.
- The percentage of all sentinel primary care specimens from patients presenting with ILI or ARI symptoms that tested positive for an influenza virus decreased to 14% from 17% in the previous week.
- Two countries reported seasonal influenza activity above 30% positivity in sentinel primary care: Finland (70%) and the Netherlands (35%).
- Both influenza type A and type B viruses were detected with A(H3) viruses being dominant across all monitoring systems.
- Hospitalized patients with laboratory confirmed influenza were infected with type A or B viruses.
For week 18/2022 of 40 countries and areas reporting on intensity of influenza activity, 22 reported baseline-intensity (across the Region), 14 reported low-intensity (across the Region), 2 reported medium-intensity (Georgia and Latvia), 1 reported high-intensity (Luxembourg) and 1 reported very high-intensity (Finland).
Of 41 countries and areas reporting on geographic spread of influenza viruses, 10 reported no activity (in eastern, southern and western areas), 11 reported sporadic spread (across the Region), 5 reported local spread (Czechia, Kosovo (in accordance with UN Security Council Resolution 1244 (1999)), Malta, Republic of Moldova and Slovakia), 2 reported regional spread (Lithuania and Luxembourg) and 13 reported widespread activity (across the Region).
- 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.
* The administrative boundaries include spatial feature for Kosovo, this designation being without prejudice to position on status, and is in line with United Nations Security Council Resolution 1244 (1999) and the International Court of Justice Opinion on the Kosovo Declaration of Independence.
© European Centre for Disease Prevention and Control 2022
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