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Background: M. pneumoniae pneumonia (MP) has been reported in 10-40% of community-acquired pneumonia cases. We aimed to evaluate the difference of clinical features in children with MP, according to their age and chest radiographic patterns. The diagnosis of MP was made by examinations at both admission and discharge and by two serologic tests: the indirect microparticle agglutinin assay (1:40) and the cold agglutinins titer (1:32). A total of 191 children with MP were grouped by age: 2 years of age (29 patients), 3-5 years of age (81 patients), and 6 years of age (81 patients). They were also grouped by pneumonia pattern: bronchopneumonia group (96 patients) and segmental/lobar pneumonia group (95 patients). Results: Eighty-six patients (45%) were seroconverters, and the others showed increased antibody titers during hospitalization. Among the three age groups, the oldest children showed the longest duration of fever, highest Creactive protein (CRP) values, and the most severe pneumonia pattern. The patients with segmental/lobar pneumonia were older and had longer fever duration and lower white blood cell (WBC) and lymphocyte counts, compared with those with bronchopneumonia. The patient group with the most severe pulmonary lesions had the most prolonged fever, highest CRP, highest rate of seroconverters, and lowest lymphocyte counts. Thrombocytosis was observed in 8% of patients at admission, but in 33% of patients at discharge. In MP, older children had more prolonged fever and more severe pulmonary lesions. The severity of pulmonary lesions was associated with the absence of diagnostic IgM antibodies at presentation and lymphocyte count. Short-term paired IgM serologic test may be mandatory for early and definitive diagnosis of MP. Mycoplasma pneumoniae (M. pneumoniae) is an important causative organism of respiratory infections in children and young adults. M. pneumoniae pneumonia (MP) has been reported in 10-40% of community-acquired pneumonia cases, and recent studies have indicated that younger children (<5 years of age), as well as school-aged children, are prone to M. pneumoniae infection [1-6]. In Korea, M. pneumoniae epidemics have occurred every 3-4 years since the 1980s; in the most recent epidemics, the peak age was younger than that seen previously [6] . However, few studies have attempted a clinical comparison of MP according to age [4, 5] . The pre-publication history for this paper can be accessed here:
Difference of clinical features in childhood Mycoplasma pneumoniae pneumonia