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Table 1 Participation to Influenzanet in the 2011/2012 season

From: The representativeness of a European multi-center network for influenza-like-illness participatory surveillance

Influenzanet country No. registered individuals No. active** participants % active in sample No. active in country (per 100,000)
BE 4,362 3,915 90% 56.7
FR* 3,936 3,044 77% 6.2
IT 2,283 1,266 55% 2.1
NL 14,479 12,699 88% 76.2
PT 1,410 1,075 76% 10.2
SE* 2,657 1,676 63% 17.8
UK 2,547 1,806 71% 2.9
Influenzanet 31,674 25,481 80% 8.0
  1. *first season.
  2. **an active participant is defined as having filled at least three weekly symptoms surveys; it is also referred in the article simply as participant (see main text).