CD79A and obesity due to melanocortin 4 receptor deficiency: A significantly higher frequency of individuals with obesity was also present in the low-BIH group for magnitude of IgA antibodies to H1 proteins (RR, 2.02; 95% CI, 1.27 to 3.21) but not to A/H1N1 viruses (RR, 1.10; 95% CI, 0.72 to 1.69) (Fig. 4E and G; Fig. S6E and G and S7A).