In all reporting countries, influenza activity continued to decline or had already returned to baseline levels. After more than three months of active transmission, a long period compared to other years, the 2012–13 influenza season is waning and moving towards its end, concludes the Weekly Influenza Surveillance Overview for week 15.
Of the 29 countries reporting for week 14/2013, 23 countries indicated low intensity transmission, and all countries reported decreasing or stable trends. No country reported high intensity.
Virological surveillance shows that the proportion of influenza-positive sentinel specimens (34%) has continued to decrease since the peak observed in week 5/2013 (61%), with a considerably lower number of specimens tested.
Since week 40/2012, 47% of sentinel surveillance specimens testing positive for influenza virus have been type A, and 53% type B. Of the influenza A viruses subtyped, the proportion of A(H1)pdm09 viruses has been 64%.
In line with the downward trend of seasonal influenza in Europe, ECDC moves to bi-weekly reporting on influenza surveillance. The next influenza surveillance overview will be issued on 3 May and will cover weeks 16 and 17.
For ECDC updates on the avian influenza A(H7N9) virus, go to: