A positive association between high levels of IgA anti - P. gingivalis and the leprosy reaction was observed in the unadjusted model (ORunadjusted: 2.24; 95% CI 1.25–4.00) and in the model adjusted for the covariables age, sex, education level and alcoholic beverage consumption (ORadjusted: 2.55; 95% CI 1.34–4.87), as can be observed in Table 2. The gene discussed is CD79A; the disease is leprosy.