Weekly influenza update, week 40, 2017

Period: 02 Oct 2017 - 09 Oct 2017

ECDC and WHO/Europe publish weekly influenza surveillance data in the report Flu News Europe. This report covers the period week 40 (2-9 October) 2017.

Week 40, 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.  

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 is available here.