Weekly influenza surveillance overview: low influenza activity in Europe

epidemiological update

The latest Weekly influenza surveillance overview (WISO) shows low influenza activity in Europe. For the first time this season local spread was reported by the Netherlands, while the majority of countries reported absence of geographic spread.

During week 46 (14-20 November 2011), all 26 countries providing data to the European Surveillance System (TESSy) database reported low influenza activity. 

For the first time this season local spread was reported by the Netherlands, while the majority of countries reported absence of geographic spread.

In relation to the virological data, 11 of the specimens out of 535 sentinel specimens tested were positive for influenza virus. In addition, 22 non-sentinel source specimens, e.g. specimens collected for diagnostic purposes in hospitals, were positive for influenza virus. Of the total 33 influenza viruses detected, 24 were type A, and nine type B.

The collected data shows that seven weeks after the beginning of the surveillance season for influenza in the Northern Hemisphere, the winter epidemics of influenza have not yet started in Europe.

Read the latest Weekly influenza surveillance overview, 14 – 20 Nov 2011 (Week 46)