Most common bacteria: S pneumoniae 61.54%, K pneumoniae 38.46%, M catarrhalis 23.08%, S aureus 20.51%, P aeruginosa 12.82%.
Vi khuẩn hay găp: S. pneumoniae 61,54%, K. pneumoniae 38,46%, M. catarrhalis 23,08%, S.aureus 20,51%, P.aeruginosa 12,82%.