Perinatal PCB exposure (Faroe Islands) associated with decreased Ig titers against Tetanus and Diphtheria vaccines (59, 60)Perinatal dioxin and dioxin- and non-dioxin-like PCB exposure (Norway) associated with decreased Ig titers against measles vaccine but not rubella, tetanus or influenza vaccines (61)Perinatal PCB-153# exposure (eastern Slovakia) correlated with decreased antigen-specific IgA and IgG titers against tuberculosis vaccine (62). This evidence concerns the gene CD79A and tuberculosis.