Syndromic surveillance data
Of the countries and areas in which thresholds for ILI activity are defined, countries in eastern (n=2; Azerbaijan and Georgia), northern (n=3; Denmark, Estonia and Latvia), southern (n=1; Croatia) and western (n=2; Belgium and Luxembourg) areas of the European Region reported activity above baseline levels.
Of the countries and areas in which thresholds for ARI activity are defined, all reported activity within baseline levels.
Assessment of the syndromic surveillance data of ILI or ARI rates might be driven by respiratory infections other than influenza virus, including SARS-CoV-2, leading to observed increases in the absence of influenza virus detections. The thresholds mentioned are based on the Moving Epidemic Method (MEM) method and based on historic ILI/ARI data.
Viruses detected in sentinel-source specimens (ILI and ARI)
For week 18/2022, 128 (14%) of 932 sentinel specimens tested positive for an influenza virus; 126 (98%) were type A and 2 (2%) were type B. Of 96 subtyped A viruses, 95% were A(H3) and 5% A(H1)pdm09. Of 20 countries or areas across the Region that each tested at least 10 sentinel specimens in week 18/2022, 9 reported a rate of influenza virus detections above 10% (median 22%; range 11% - 70%): Finland (70%), Netherlands (35%), France (25%), Germany (23%), Georgia (22%), Luxembourg (21%), Norway (20%), Denmark (18%) and Czechia (11%).
For the season to date, 6 675 (12%) of 56 824 sentinel specimens tested positive for an influenza virus. More influenza type A (n=6 583, 99%) than type B (n=92, 1%) viruses have been detected. Of 5 471 subtyped A viruses, 5 099 (93%) were A(H3) and 372 (7%) were A(H1)pdm09. Of 13 influenza type B viruses ascribed to a lineage, all were B/Victoria (86% of type B viruses were reported without a lineage).
Details of the distribution of viruses detected in non-sentinel-source specimens are presented in the Virus characteristics section.
External data sources
Influenzanet collects weekly data on symptoms in the general community from different participating countries across the EU/EEA. Please refer to the website for additional information for week 17/2022.
* 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.