Table 1.

Proportion of participants with documented vaccination status (vaccination record or family physician) according to reported vaccination status and study group

	pH1N1 vaccinated	pH1N1 unvaccinated	Seasonal influenza 09/10 vaccinated	Seasonal influenza 09/10 unvaccinated
	Proportion with documented vaccination status* (%)
pH1N1 positive ARI cases (N = 24)	0/0	7/24 (29%)	6/6 (100%)	5/18 (28%)
Hospital controls matched to pH1N1 positive cases (N = 40)	6/6 (100%)	12/34 (35%)	7/9 (78%)	10/39 (33%)
pH1N1 negative ARI cases (test negative controls, N = 119)	6/7 (86%)	30/110 (27%)	31/36 (86%)	19/81 (23%)
HIV patients	9/10 (90%)	11/12 (92%)	13/14 (93%)	7/7 (100%)

*Number of participants with documented vaccination status/total number of study participants in group (%).