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 47/2021, 3 239 SARI cases were reported by 10 countries or areas (Albania, Germany, Kyrgyzstan, Malta, Montenegro, Republic of Moldova, Russian Federation, Serbia, Spain and Ukraine). Of 316 specimens tested for influenza viruses, 26 (8%) were positive for influenza type A viruses.
For week 47/2021, 7 countries or areas reported a total of 1 491 tests and 738 detections of SARS-CoV-2 virus (49.5% detections overall, varying from 18.2% in Malta to 95% in Montenegro) from SARI cases.
For the season, 35 312 SARI cases were reported by 18 countries or areas (Albania, Armenia, Belarus, Georgia, Germany, Kazakhstan, Kyrgyzstan, Malta, Montenegro, North Macedonia, Republic of Moldova, Russian Federation, Serbia, Spain, Turkey, Ukraine, Uzbekistan and Kosovo (in accordance with Security Council resolution 1244 (1999)). Of 145 SARI cases testing positive for influenza virus since week 40/2021, 144 (99%) were infected with type A viruses and all 142 subtyped were A(H3) viruses. The influenza type B virus was not ascribed to a lineage.