Furthermore, multivariate analysis indicated that the duration of illness (OR: 1.198, 95% CI: 1.092–1.315, P < 0.001) and joint involvement (OR: 2.596, 95% CI: 1.097–6.147, P = 0.030) were independent predictors for IgAV recurrence (Table 2).No significant differences were observed in duration of treatment,use of CS, presence of respiratory tract infection, and other laboratory indices, such as WBC, NEU, LYM, PLT, MPV, RBC, HGB, NLR, and PLR (P > 0.05). The gene discussed is CYGB; the disease is Respiratory tract infection.