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Clinical Microbiology Reviews, Oct 1995, 451-461, Vol 8, No. 4
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Chlamydia pneumoniae (TWAR)

CC Kuo, LA Jackson, LA Campbell and JT Grayston
Department of Pathobiology, University of Washington, Seattle 98195, USA.

Chlamydia pneumoniae (TWAR) is a recently recognized third species of the genus Chlamydia that causes acute respiratory disease. It is distinct from the other two chlamydial species that infect humans, C. trachomatis and C. psittaci, in elementary body morphology and shares less than 10% of the DNA homology with those species. The organism has a global distribution, with infection most common among children between the ages of 5 and 14 years. In children, TWAR infection is usually mild or asymptomatic, but it may be more severe in adults. Pneumonia and bronchitis are the most common clinical manifestations of infection, and TWAR is responsible for approximately 10% of cases of pneumonia and 5% of cases of bronchitis in the United States. The microimmunofluorescence serologic assay is specific for TWAR and can distinguish between recent and past infections. The organism can be isolated in cell culture; however, PCR techniques have recently facilitated its detection in tissues and clinical specimens.

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