OBJECTIVE To explore the clinical significance of detection of immunoglobulin of pathogens causing atypical pneumonia in diagnosis of lower respiratory tract infections in children and understand the pathogenic spectrum and etiological characteristics of the children with lower respiratory tract infections in Guilin area so as to provide guidance for clinical diagnosis and treatment.METHODS A total of 2 495 children with lower respiratory tract infections who were treated in the hospital from Nov 2012 to Oc...