The clinical characteristics of Mycoplasma pneumoniae pneumonia in children younger than 6 years old

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The characteristics of Mycoplasma pneumoniae pneumonia in adult are nonproductive cough, lack of rales, and the white blood cell counts are<10, 000/μL.The aim of this study was to investigate the clinical characteristics of hospitalized cases with M.pneumoniae pneumonia in children younger than 6 years old.A retrospective analysis of 83 children (0-15 years old) at the Chiba Municipal Kaihin Hospital in 2005 was performed.Serologic diagnosis was made based on a 4-fold rise or single titers>/=1: 640, which were measured by particle aggulutination (PA) test.Children younger than 6 years old accounted for 51.8% (43 cases) of the cases.Among the children younger than 6 years old, 90.0% had productive cough.Rales and altered breath sounds could be heared in 83.7% and white blood cell counts were elevated higher than 10, 000/μL in 31.8% of patients without athma and bacterial infection.37.2% of patients complicated bronchiolitis or infectious asthma.41.9% of patients had found to have mixed bacterial infection and/or viral infection.In conclusion, the clinical characteristics M. pneumoniae pneumonia in children younger than 6 years old differ evidently from those of adults because of mixed bacterial infection and/or viral infection, and complicated bronchiolitis or infectious asthma.