Practitioners and patient recruitment in the 2009–2010 influenza season relevant to the I-MOVE study.

aILI patients meeting the EU case definition, swabbed bFor each study site, from 15 d after the start of the vaccination campaign up to the week that preceded 2 consecutive weeks in which none of the ILI patients recruited tested positive for influenza A (H1N1) 2009 recruited. In Hungary, the start of the study period was the week of receiving the agreement from the Ethics Committee.cILI patients in the study after excluding those having tested previously to pH1N1, those positive to other influenza virus, and those with missing information on laboratory results.