CD79A and immunodeficiency disease: Immunodeficiency was shown to be a risk factor of IgG seroprevalence (RR 1.25; 95%CI 0.8–1.9; p = 0.025); however, it was not confirmed for IgA prevalence (RR 1.1; 95%CI 0.9–1.2; p = 0.072) in the group tested during the first observation.