Prenatal exposure to polychlorinated biphenyls and dioxins from the maternal diet may be associated with immunosuppressive effects that persist into early childhood

► Prenatal dietary exposure to PCBs and dioxins was associated with increased risk of wheeze and infections in children. ► Prenatal dietary exposure to PCBs and dioxins was associated with reduced response to a measles vaccine in children. ► Prenatal dietary exposure to PCBs and dioxins may result in immunosuppression at tolerable weekly intake levels.