Monitoring of antiviral resistance in EU for the season 2008-09 is currently ongoing. The coordinators of The Community Network of Reference Laboratories for Human Influenza in Europe (CNRL), routinely collect, analyze and disseminate information on antiviral resistance from Influenza viruses isolated from 25 European (European Union, EEA/EFTA) countries.
The analysis of resistance against Neuraminidase Inhibitors and Adamantanes is done by measuring IC50 values and/or by genotyping of viruses for detection of known drug resistance mutations.
Summary information on antiviral resistance in EU is published in the Weekly Influenza Surveillance Overview (WISO).