Prevalence of Chlamydia pneumoniae infection in Thai children with community-acquired pneumonia.

The prevalence of Chlamydia pneumoniae infection in children with community-acquired pneumonia was investigated at Chulalongkorn Hospital, Bangkok from 1999 through 2001. Serologic evidence of acute C. pneumoniae infection was found in 149 of 333 (44.7%) children, of whom 132 of 149 (88%) were <5 years of age. The findings provide further evidence that C. pneumoniae infection is common in very young children.