In contrast with the traditional system of sentinel networks of mainly primary care physicians, Influenzanet obtains its data directly from the population. This creates a fast and flexible monitoring system whose uniformity allows for direct comparison of ILI rates between countries.
Any resident of a country where Influenzanet is implemented can participate by completing an online application form, which contains various medical, geographic and behavioural questions. Participants are reminded weekly to report any symptoms they have experienced since their last visit. The incidence of ILI is determined on the basis of a uniform case definition.
It has been operational in the Netherlands and Belgium (since 2003), Portugal (since 2005), Italy (since 2008) and United Kingdom (since 2009), and the current objective is to implement Influenzanet in more European countries.
The ISI Foundation participates in Influenzanet project through the Italian web portal Influweb.