Weekly influenza update, week 42, 2017
ECDC and WHO/Europe publish weekly influenza surveillance data in the report Flu News Europe. This report covers the period week 42 (9-15 October) 2017.
Week 42/2017 (16 – 22 October 2017)
- Of the 40 countries reporting on influenza activity, 39 reported low intensity, while Malta reported medium intensity.
- Only 14 sentinel specimens tested positive for influenza. Two thirds of detected viruses were type A and one third type B. Overall, 3% of sentinel specimens were positive for influenza virus.
- Data from the 19 countries or regions reporting to the EuroMOMO project indicated all-cause mortality to be at expected levels for this time of the year.
2017/18 season overview
- Since week 40/2017, low numbers of influenza viruses have been detected in sentinel specimens but, of all typed viruses, the proportion of type A viruses has been increasing and reached 64% in week 42/2017.
Due to the diversity of A(H3N2) influenza viruses that circulated during the 2017 Southern Hemisphere season and reports of low vaccine effectiveness (17% against A(H3N2) overall), 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 season.
Read more about influenza surveillance
Seasonal influenza is a preventable infectious disease with mostly respiratory symptoms. It is caused by influenza virus and is easily transmitted, predominantly via the droplet and contact routes and by indirect spread from respiratory secretions on hands etc.Read more
Surveillance reports and disease data on seasonal influenza
Surveillance reports and data: Disease data from ECDC Surveillance Atlas, Annual Epidemiological Reports, Surveillance reports.Read more