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 infection (SARI; countries and areas mostly located in the eastern part of the Region).

Severe acute respiratory infection (SARI)-based hospital surveillance
  • For week 14/2021, 14 999 SARI cases were reported by 13 countries or areas. Of 396 specimens tested for influenza viruses, none were positive.


  • For the season to date, 13 countries and areas (Albania, Armenia, Azerbaijan, Belarus, Bosnia and Herzegovina, Georgia, Kazakhstan, Kosovo (in accordance with UN Security Council resolution 1244 (1999)), Republic of Moldova, Russian Federation, Serbia, Ukraine and Uzbekistan) have reported 37 758 SARI cases and 11 030 were tested for influenza viruses. To date, 20 specimens have tested positive for influenza viruses: 12 from Ukraine (8 were A(H1)pdm09 viruses and 4 were type A, not subtyped), 7 from Armenia (all A(H3) subtype) and 1 from Azerbaijan (a B/Victoria lineage virus).