The objective of the present study was to establish the occurrence of Chlamydia pneumoniae by direct detection in gargled-water specimens obtained from 193 children suffering from acute or chronic respiratory infections. Specimens were analyzed by an indirect immunofluorescence test (IIF), a genus-specific antigen enzyme immunosorbent assay (EIA) and the polymerase chain reaction (PCR). The pathogen was detected in three children by PCR only. As underlying disease, chronic obstructive bronchitis resistant to therapy was reported. In two of the children, the presence of pneumonia could be verified by X-ray. With a detection threshold of target DNA obtained from two inclusion forming units (IFU), the PCR proved clearly more sensitive than EIA becoming positive at levels of 100 IFU and above. No interpretable results could be obtained for the IIF.
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