Spectrum of pathogens by age group among (A) all CAP patients, (B) NSCAP patients and (C) SCAP patients. Bars indicate the detection yield of each pathogen; line indicates the detection yield of pathogens together. Over VMC stands for the overall positive rate of respiratory viruses, MP and CP, It means the rate of the patients with at least one of 9 respiratory viruses, MP and CP detected. CAP, community-acquired pneumonia; NSCAP, non-severe CAP; SCAP, severe CAP.