However, the results of a separate longitudinal investigation conducted by Buka et al. [51], which monitored over 55,000 pregnancies in the USA from 1959 to 1966 and assessed maternal IgA and IgG antibody titres to rubella, did not reveal a statistically significant correlation between prenatal rubella exposure and the likelihood of schizophrenia in adult progeny. This evidence concerns the gene CD79A and rubella.