GSTP1 and bronchiolitis: Exposure to high levels of perinatal anxiety affected the development of RTIs, especially bronchiolitis, differently during infancy, depending on the polymorphisms of ROS detoxification genes such as GSTP1 (rs1695) and GSTT1. The combined effect of exposure to perinatal maternal anxiety and ROS detoxification gene polymorphisms on the occurrence of LRTIs, especially bronchiolitis, may be partially attributable to the increased ROS generation caused by high levels of perinatal maternal anxiety.