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Pneumonia Associated with the TWAR Strain of Chlamydia

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Grant support: in part by a grant from National Health and Welfare, Canada, and in part by grants AI 16222 and AI 21885 from the U. S. National Institutes of Health.

Presented in part at the 25th Interscience Conference on Antimicrobial Agents and Chemotherapy, Minneapolis, Minnesota, 1 October 1985.

▸Requests for reprints should be addressed to T. J. Marrie, M.D.; Room 4090 A.C.C., Victoria General Hospital, 1278 Tower Road; Halifax, Nova Scotia B3H 2Y9, Canada.

© 1987 American College of PhysiciansAmerican College of Physicians

Ann Intern Med. 1987;106(4):507-511. doi:10.7326/0003-4819-106-4-507
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From November 1981 to August 1984, 301 adult patients with community-acquired pneumonia were admitted to the major referral hospital of Nova Scotia. Serologic tests done on these patients included microimmunofluorescence using the TWAR strain of Chlamydia and all Chlamydia trachomatis serovars as antigens. The TWAR strain has been shown to cause mild pneumonia in teenagers and young adults. Of the 301 patients, 18 (6%) had serologic evidence of recent infection with the TWAR organism. Their mean age was 64 years. Pneumonia associated with the presence of acute TWAR antibody had no characteristic clinical or radiographic features when compared with pneumonia without acute chlamydia antibody. Six patients, who all had preexisting serious chronic disease, had severe illness, and 2 died. Both patients who died had complicated hospital courses and other concomitant infections. We conclude that the TWAR organism may cause pneumonia in older adults and persons with chronic diseases that require hospitalization.


pneumonia ; chlamydia





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