Table 5 Response of participants with no influenza vaccination in the previous year (2002).

	SLE patients (n = 22)	Healthy Controls (n = 16)	p Value
A/H1N1 titre ⩾40 after vaccination	18 (82%)	16 (100%)	0.124
A/H1N1 seroconversion or fourfold titre rise	14 (64%)	16 (100%)	0.012
A/H3N2 titre ⩾40 after vaccination	19 (86%)	16 (100%)	0.249
A/H3N2 seroconversion or fourfold titre rise	10 (45%)	15 (94%)	0.002
B/Hong Kong titre ⩾40 after vaccination	15 (68%)	12 (75%)	0.729
B/Hong Kong seroconversion or fourfold titre rise	13 (59%)	12 (75%)	0.490

Fisher's exact test was used for all variables.

SLE, systemic lupus erythematosus.