Objective To analyze the pulmonary function and clinical features in infants and young children with pneumonia due to Streptococcus pneumoniae. Methods In this retrospective study, we reviewed the clinical records in 72 infants and young children with pneumonia due to S.pneumoniae and the outcomes of pulmonary function tests performed using SensorMedics 2600 system in 32 of them. Results The ventilatory function was normal in all the 32 infants. Increased large airway resistance was found in 12, so were inc...