A total of 152 children attending Hebei Provincial People's Hospital, Shijiazhuang, Hebei with diagnosed pneumonia under the age group of 1 month to 12 years of both sexes were included in our study. All the parents/guardians were informed about the study at after obtaining their consent. The institutional ethical committee approved the study design, Fifty children with complains of lower respiratory infection, but negative for M.pneumoniae by IgM Enzyme linked immunosorbent assay were included as a control group in our study.