Table 4

 Geometric mean titres of HI antibodies (μg/ml) against influenza antigens in rheumatoid patients and controls before and six weeks after vaccination

VaccineRAControl
Week 0Week 6Week 0Week 6
*p<0.05.
HI, haemagglutination inhibition; RA, rheumatoid arthritis.
B/Hong Kong/330/2001 (HK)4 (1.4)5.3 (1.2)3.83 (1.5)6.1 (0.9)*
A/Panama/2007/99 (PAN)4.03 (1.4)5.33 (1.5)4.4 (1.4)5.8 (1.2)
A/New Caledonia/20/99 (NC)3.4 (1.4)4.7 (1.4)2.9 (1.0)5.1 (1.3)