CD79A and Henoch-Schoenlein purpura: In another prospective study ASLO titer positivity was associated with a 10-fold increase in the risk of developing IgA vasculitis [28] and examination of kidney biopsies revealed presence of IgA-binding region of three different streptococcal M proteins, namely, M4, M22, and M60, in seven out of 13 subjects.