PMID(sorted ascending)
etiological agents of lower respiratory tract infections in japanese investigate the etiology of pediatric community-acquired pneumonia and bronchitis, we conducted a prospective, population-based study covering the total population < 15 years of age in 16 municipalities in hokkaido, japan, during the period of april 2000 to march 2001. chest radiographs were available for all cases (n = 921; 398 as pneumonia and 523 as bronchitis) and paired sera for serologic assays were available for more than half of the cases. the following specimens were also collected: ...200415011754
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