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Table 1 Study schedule of the case–control study in the period before and after the change of notification criteria for influenza A(H1N1) 2009 virus infection at the 15 th of August 2009, the Netherlands

From: Utility of the first few100 approach during the 2009 influenza A(H1N1) pandemic in the Netherlands

   Day 0 Day 5 range [4-6] Day 10 range [9-11] Day 30 range [28–35]
Up to 15 August 2009 visit1 visit2 visit3 visit4
case patients nose- and throat swab*   X X  
venipuncture X^   X X
control subjects nose- and throat swab X    
venipuncture X   X X
From 15 August 2009 GP visit visit1 visit2 visit3
case patients nose- and throat swab X^ X X  
venipuncture X^ # X X X
control subjects nose- and throat swab   X   
venipuncture   X X X
  1. * The diagnostic nose- and throat swab on which the patients were included in the study was taken by the physician of the municipal health service and is not entered in the schedule.
  2. ^ For hospitalised cases the first visits, until the moment of discharge, were scheduled in hospital.
  3. # The GP took a finger prick instead of a venipuncture.