Table 7 Influence of immunosuppressive drug treatment on vaccination efficacy: titres ⩾40 to influenza.

	No drug treatment (n = 12)	Hydroxychloroquine (n = 17)	Azathioprine (n = 13)	Prednisone (n = 14)	p Value
A/H1N1 ⩾40 before vaccination	6 (50%)	8 (47%)	7 (54%)	6 (43%)	0.982
A/H1N1 ⩾40 after vaccination	11 (92%)	14 (82%)	9 (69%)	13 (93%)	0.396
A/H3N2 ⩾40 before vaccination	8 (67%)	11 (65%)	7 (54%)	9 (64%)	0.929
A/H3N2 ⩾40 after vaccination	12 (100%)	16 (94%)	8 (62%)	12 (86%)	0.030
B/Hong Kong ⩾40 before vaccination	5 (42%)	2 (12%)	4 (31%)	3 (21%)	0.295
B/Hong Kong ⩾40 after vaccination	11 (92%)	12 (71%)	8 (62%)	8 (57%)	0.226

Fisher's exact test was used for all variables.