Weekly influenza update, week 46, November 2017
ECDC and WHO/Europe publish weekly influenza surveillance data in the report Flu News Europe.
- Influenza activity across Europe remained at a low level.
- Of the individuals sampled on presenting with ILI or ARI to sentinel primary healthcare sites, 3.7% tested positive for influenza viruses, which is similar to the previous week (4.4%).
- Data from 21 countries or regions reporting to the EuroMOMO project indicated that all-cause excess mortality was within normal ranges for this time of year.
2017/18 season overview
- Since week 40/2017, few influenza viruses have been detected in sentinel and non-sentinel specimens.
- For detections from sentinel surveillance systems, the proportions of influenza A(H1N1) pdm09 and A(H3N2) viruses were similar, while from non-sentinel sources most detections were A(H3N2). For both sentinel and non-sentinel surveillance systems, most influenza B viruses assigned to a lineage were B/Yamagata.
- While low in number (n=34), over 68% of the A(H3N2) viruses genetically characterized belonged to clade 3C.2a, the vaccine virus clade, as described in the WHO recommendations for vaccine composition for the northern hemisphere 2017–18.
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