Serum IgA immunoreactivity was significantly higher in patients with BD than in those with SLE, with the other forms of primary vasculitis, with IBD and in healthy subjects (P < 10-4 for BD versus SLE, BD versus healthy subjects, BD versus IBD; P = 0.012 for BD versus vasculitis by Mann-Whitney) (Figure 2c). This evidence concerns the gene CD79A and vasculitis.