Figure 1 Influence of vaccination on disease activity in the different patient groups. Disease activity was measured by the SLE disease activity index (SLEDAI) (A) and patient visual analogue score (VAS) (B), depicting patients' perception of disease activity. Columns are means, error bars = SEM. The left bars in each pair represent results before, the right bars 30 days after vaccination. *p<0.05 (Wilcoxon signed rank test).