Weekly influenza update, week 43, 2017

data map table
Period: 23 Oct 2017 - 29 Oct 2017

ECDC and WHO/Europe publish weekly influenza surveillance data in the report Flu News Europe. This report covers the period week 43 (23-29 October) 2017.

Week 43/2017 (23 – 29 October 2017) 

  • Intensity of influenza activity in Europe is still low.
  • Sporadic or local influenza virus detections were reported by 10 out of 38 countries.
  • Overall, 2.5% of sentinel specimens tested positive for influenza virus.
  • Data from the 19 countries or regions reporting to the EuroMOMO project indicated that all-cause mortality was at expected levels for this time of the year. 

2017/18 season overview 

  • Since week 40/2017, only few influenza viruses have been detected in sentinel specimens.
  • Due to changes in A(H3N2) influenza viruses that circulated during the recent 2017 Southern Hemisphere season and reports of low vaccine effectiveness against this strain, WHO recently recommended changing the A(H3N2) component 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. This represents two changes compared to the current trivalent vaccine recommended for 2017–2018 Northern Hemisphere influenza season. See also the ECDC summary report for September and the ECDC commentary.