Weekly influenza overview

Week 47/2022 (21 November - 27 November 2022)

 

• The percentage of all sentinel primary care specimens from patients presenting with ILI or ARI symptoms that tested positive for an influenza virus increased to 14% from 13% in the previous week.
• The epidemic threshold is set at 10% and week 47/2022 was the third consecutive week above this level with the start of the epidemic in the European Region being declared based on week 46/2022 data.
• Germany, Kazakhstan, Kyrgyzstan, Malta, Portugal, Romania, Russian Federation, Türkiye and United Kingdom (Scotland) reported widespread influenza activity and/or at least medium intensity.
• Germany, Spain, France, Israel, Italy, Kyrgyzstan, Kazakhstan, Luxembourg, Republic of Moldova, Portugal and Uzbekistan reported seasonal influenza activity above 10% positivity in sentinel primary care.
• Both influenza type A and type B viruses were detected with A(H3) viruses being dominant in sentinel and non-sentinel surveillance systems.
• Hospitalized cases with confirmed influenza virus infection were reported from ICU wards (2 type A viruses), other wards (64 type A viruses and 2 type B viruses) and SARI surveillance (60 type B viruses and 39 type A viruses). When comparing the different influenza type distributions by system, it is important to consider that different sets of countries report to each system.

 

Qualitative indicators

For week 47/2022, of 40 countries and areas reporting on intensity of influenza activity, 13 reported baseline-intensity (across the Region), 22 reported low-intensity (across the Region), 3 reported medium-intensity (Germany, Kyrgyzstan and Romania) and 2 reported high-intensity (Malta and Russian Federation).


Of 41 countries and areas reporting on geographic spread of influenza viruses, 6 reported no activity (Azerbaijan, Bulgaria, Croatia, Serbia, Tajikistan and Kosovo (in accordance with UN Security Council Resolution 1244 (1999))), 18 reported sporadic spread (across the Region), 2 reported local spread (Estonia and Malta), 9 reported regional spread (across the Region) and 6 reported widespread activity (Germany, Kazakhstan, Portugal, Russian Federation, Türkiye and United Kingdom (Scotland)).

 

Please note: 

• 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 caused by viruses 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.

 

© World Health Organization 2022
© European Centre for Disease Prevention and Control 2022
Reproduction is authorised, provided the source is acknowledged

The designation employed and the presentation of this material do not imply the expression of any opinion whatsoever on the part of the Secretariat of the World Health Organization concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers and boundaries.
* 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.
Administrative boundaries: © EuroGeographics, © UN-FAO.