PEDIATRICS Vol. 63 No. 2 February 1979, pp. 192-197
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Clinical Characteristics of the Afebrile Pneumonia Associated With Chlamydia trachomatis Infection in Infants Less Than 6 Months of Age

Margaret A. Tipple M.D.1, Marc O. Beem M.D.1, and Evelyn M. Saxon B.S.1

1 Department of Pediatrics, University of Chicago, Chicago

Respiratory tract colonization with Chlamydia trachomatis commonly occurs in natally acquired chlamydial infection and is sometimes associated with a chronic, afebrile pneumonia that has relatively distinctive clinical characteristics. To further define the frequency and clinical characteristics of lower respiratory tract disease associated with C trachomatis, we grouped 56 infants aged less than 6 months with afebrile pneumonia according to nasopharyngeal shedding of Chlamydia and viruses and compared their illnesses. Forty-one (73%) were positive for C trachomatis (23 had C trachomatis only, while 18 had C trachomatis plus a virus [cytomegalovirus, respiratory synctial virus, adenovirus, rhinovirus, or enterovirus]), and 15 were C trachomatis negative (nine had a virus only, and six had neither C trachomatis nor virus). The 41 infants with C trachomatis alone or C trachomatis plus a virus were similar clinically and differed significantly from other infants in several ways: (1) onset of symptoms before 8 weeks of age; (2) gradually worsening symptoms; (3) presentation for care at 4 to 11 weeks of age; (4) presence of conjunctivitis and ear abnormalities; (5) chest roentgenograms showing bilateral, symmetrical, interstitial infiltrates and hyperexpansion; (6) peripheral blood eosinophils ge300/cu mm; and (7) elevated values for serum immunoglobulins M, G, and A.

Submitted on April 6, 1978
Accepted on June 30, 1978




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