Influenzanet is a system to monitor the activity of influenza-like-illness (ILI) with the aid of volunteers via the internet

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Developing the framework for an epidemic forecast infrastructure.

The Seventh Framework Programme (FP7) bundles all research-related EU initiatives.

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Participating countries and volunteers:

Participating countries and volunteers:

The Netherlands 11954
Belgium 3946
Portugal 1747
Italy 4295
Great Britain 4165
Sweden 6702
Austria 508
Switzerland 139
France 6236
Spain 996
Ireland 295
Denmark 1309
InfluenzaNet is a system to monitor the activity of influenza-like-illness (ILI) with the aid of volunteers via the internet. It has been operational in The Netherlands and Belgium (since 2003), Portugal (since 2005) and Italy (since 2008), and the current objective is to implement InfluenzaNet in more European countries.

In contrast with the traditional system of sentinel networks of mainly primary care physicians coordinated by the European Influenza Surveillance Scheme (EISS), 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.

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Incidence data

The incidence for Influenza-like Illness (ILI) can be downloaded as CSV files (importable into Excel). The number of active participants, the number of ILI onsets and the calculated incidence are listed for each week. When using these data please attribute it to Influenzanet as follows: "Data Source: Influenzanet (".

The Netherlands (8.1 KB)
Belgium (7.1 KB)
Portugal (5.1 KB)
Italy (3.6 KB)
UK (1.3 KB)

Restricted access

To obtain access to the more detailed Influenzanet data, please contact the national organisers of the Influenzanet systems. Any privacy sensitive information, such as email-addresses, will not be shared with third parties.

Influenzanet welcomes collaboration with scientists and researchers outside our consortium. If you are interested, in particular in international Influenzanet data, please fill in the application form. Your application is subject to approval from the Influenzanet Science Committee, which aims to react within short notice to your request:

Icon 110627-Data_ApplicationForm.pdf (259.7 KB)

Influenzanet Science Committee

Dr. Daniela Paolotti
ISI, Turin, Italy

Prof. dr. John Edmunds
London School of Hygiene and Tropical Medicine, London, UK

Dr. Vittoria Colizza

Dr. Ricardo Mexia
Instituto Nacional de Saúde Doutor Ricardo Jorge, Lisbon, Portugal

Secretary: Ronald Smallenburg
directie [at]