Hospital Surveillance

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 infections (SARI).

 

Severe acute respiratory infection (SARI)-based hospital surveillance

For week 47/2022, 5 305 SARI cases were reported by 15 countries or areas (Albania, Belarus, Germany, Ireland, Kazakhstan, Kyrgyzstan, Lithuania, Republic of Moldova, Romania, Russian Federation, Serbia, Spain, Türkiye, Ukraine and Uzbekistan). Of 630 specimens tested for influenza viruses, 16% (n=99) were positive. Of these, influenza type B viruses (n=60, 61%) were detected more frequently than influenza type A viruses (n=39, 39%). The highest positivity rates for influenza virus detections were reported by Kyrgyzstan (27%), Kazakhstan (24%) and Russian Federation (20%).

 

For the season, 36 584 SARI cases were reported by 23 countries or areas (Albania, Armenia, Belarus, Bosnia and Herzegovina, Croatia, Georgia, Germany, Ireland, Kazakhstan, Kyrgyzstan, Lithuania, Malta, Montenegro, North Macedonia, Republic of Moldova, Romania, Russian Federation, Serbia, Spain, Türkiye, Ukraine, Uzbekistan and Kosovo (in accordance with Security Council resolution 1244 (1999))). For SARI cases testing positive for influenza virus since week 40/2022, type B viruses have been the most common (n=393 79%; 345 from Kazakhstan, 42 from Kyrgyzstan, 4 from Russian Federation, 1 from North Macedonia and 1 from Ireland). Of the 104 cases with influenza A, subtyping was performed for 81 viruses: 58 (72%) were infected by A(H1)pdm09 viruses and 23 (28%) were infected by A(H3) viruses. Of those influenza B viruses that have been ascribed to a lineage (n=139, 79%), all were B/Victoria.

 

 

* 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.