Bacterial Co-infection in Hospitalized Children with Mycoplasma pneumoniae Pneumonia.

OBJECTIVE To describe the frequency and impact of bacterial co-infections in children hospitalized with Mycoplasma pneumoniae pneumonia. DESIGN Retrospective, descriptive study. SETTING Tertiary-care hospital in Beijing, China. PARTICIPANTS 8612 children admitted to Beijing Childrens Hospital from June 2006 to June 2014. METHODS According to the testing results of etiology we divided the cases into pure M. pneumoniae infection group and mixed bacterial infection group. We analyzed clinical features, hospital expenses and differences between these two groups. RESULTS 173 (2%) of included children had bacterial coinfection. 56.2% of bacterial pathogens were identified as Streptococcus pneumoniae. CONCLUSION The most common bacterium causing co-infection in children with M. pneumoniae pneumonia was S. pneumoniae.