China National Clinical Research Center of Respiratory Diseases;Beijing Children’s Hospital;Capital Medical University;National Center for Children’s Health;Beijing;China;The First Teaching Hospital of Tianjin University of Traditional Chinese Medicine;Ti
Importance: Recurrent respiratory tract infection (RRTI) is common in children. Inappropriate RRTI treatment will lead to asthma and other diseases, thereby seriously affecting the growth and physical health of children. Immune function modulation can pre