According to the initial chest radiographs, 80 patients had pneumonia and were divided into two groups: the bronchopneumonia group (49 patients) and the segmental/lobar pneumonia group (31 patients). In pneumonia patients, pneumonic infiltrations appeared within 48 h of fever onset in 68 patients (85%). When we analyzed the inpatients according to age (0-4 years, 75 patients; 5-9 years, 104 patients; and 10-15 years, 38 patients), the rates of pneumonia in each age group were 36.0% (27/75), 45.2% (47/104) and 8.8% (6/38), respectively. The severe pneumonia (segmental/lobar type) was predominant in the older age groups (14.8% (4/27), 48.9% (23/47) and 50% (3/6), respectively).