Season overview
  • The seasonal epidemic activity threshold of 10% positivity in sentinel specimens was first crossed in week 45/2022.      

  • Following a peak at week 51/2022 with 39% positivity, influenza activity had been decreasing across the Region until week 4/2023 when it reached 21% positivity before rising again to fluctuate around 25% positivity between weeks 6 and 11/2023 before decreasing below 10% positivity in week 16/2023.      
  • Overall this season, influenza A(H3) viruses have dominated in sentinel primary care specimens, however higher circulation of A(H1)pdm09 and type B viruses was observed starting from week 50/2022 and week 2/2023, respectively. In non-sentinel specimens, higher circulation of A(H1)pdm09 (55%) than A(H3) viruses (45%) was detected.      
  • Both influenza type A and type B viruses have been detected in hospitalized patients in ICU and other wards and influenza A(H1)pdm09 viruses have dominated among SARI patients.   
  • Virus type and subtype prevalence by country and surveillance system has been variable across the season.     
  • The B/Yamagata viruses sporadically detected and reported by different countries have been further investigated and were proven to be LAIV related detections. 


Other news  

For information about the SARS-CoV-2 situation in the WHO European Region visit:

           WHO website:

           ECDC website:


Influenza positivity

For the European Region, influenza virus positivity in sentinel primary care specimens remained below the epidemic threshold, which is set at 10%.


External data sources

Mortality monitoring


The EuroMOMO report can be found here:


Please refer to the EuroMOMO websitefor a cautionary note relating to interpretation of these data.