Week 40/2017 (2 – 9 October 2017)    

  • This is the first weekly report for the 2017-2018 influenza season.
  • Low influenza activity was reported by all 36 reporting countries.
  • Influenza viruses were detected sporadically both in sentinel and non-sentinel specimens, including hospitalised patients, with both influenza A and B type viruses being detected.
  • For week 40/2017, data from the 20 countries or regions reporting to the EuroMOMO project indicated all-cause mortality at expected levels for this time of the year

Additional information on global influenza activity is available from WHO’s biweekly global updates.


2017/18 season overview 

  • As is usual for this time of year, influenza activity is low in the European Region.
  • Due to the diversity of A(H3N2) influenza viruses that circulated during the 2017 Southern Hemisphere season, WHO recently recommended a change of the A(H3N2) component for inclusion in seasonal influenza vaccines for use in the 2018 southern hemisphere influenza season. In addition, the influenza B lineage in trivalent vaccines was changed (to a B/Yamagata-lineage virus), compared to the vaccine component (a B/Victoria-lineage virus) recommended for 2017-2018 northern hemisphere influenza seasons. See also the ECDC summary report for July and the ECDC commentary.

  • A report on the antigenic and genetic characteristics of zoonotic influenza viruses and development of candidate vaccine viruses for pandemic preparedness isavailable here. 

Influenza intensity, spread and dominant virus type/subtype