A subset of countries and areas monitor severe disease related to influenza virus infection by surveillance of
1) hospitalized laboratory-confirmed influenza cases in ICUs or other wards, or
2) severe acute respiratory infection (SARI; countries and areas mostly located in the eastern part of the Region).
For week 2/2022, 3 082 SARI cases were reported by 11 countries or areas (Albania, Germany, Kazakhstan, Kyrgyzstan, Lithuania, Malta, Montenegro, Russian Federation, Serbia, Spain and Ukraine). Of 464 specimens tested for influenza viruses, 5% (n=25) were positive. All were influenza A (Fig. 10). The highest positivity rates for influenza viruses were reported by Ukraine (30%), Montenegro (25%), Serbia (25%) and Russian Federation (20%).
For the season, 71 540 SARI cases were reported by 19 countries or areas (Albania, Armenia, Belarus, Georgia, Germany, Kazakhstan, Kyrgyzstan, Lithuania, Malta, Montenegro, North Macedonia, Republic of Moldova, Russian Federation, Serbia, Spain, Turkey, Ukraine, Uzbekistan and Kosovo (in accordance with Security Council resolution 1244 (1999))). For SARI cases testing positive for influenza virus since week 40/2021, type A viruses have been the most common (n=680, 99%). For 636 cases where influenza subtyping was performed, 99.9% (n=634) were infected by A(H3) viruses and 0.1% (n=2) were infected by A(H1)pdm09 viruses. Of the 5 influenza B viruses detected, none were ascribed to a lineage.
* 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.