The specificity of IgA for the diagnosis of congenital toxoplasmosis in our study (93.0% or 97.3%, depending on the threshold of positivity) was similar to those reported by Murat et al. with values of 97.3% (n = 109/112) and 97.4% (n = 75/77) on neonatal serum and cord blood, respectively (21), as well as to other studies (23, 26), but it might depend on the number of uninfected babies included. The gene discussed is CD79A; the disease is congenital toxoplasmosis.