title: Antigenic variations of respiratory syncytial virus in recurrent infections.
mesh_terms: D000956:Antigens, Viral / Q000276:immunology*; D002648:Child; D006801:Humans; D007223:Infant; D012008:Recurrence; D012136:Respiratory Syncytial Viruses / Q000276:immunology*; D010253:Respirovirus Infections / Q000276:immunology*
chemical_list: D000956:Antigens, Viral