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Journal of Clinical Microbiology, Jan 1997, 48-52, Vol 35, No. 1
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Rabbit model for Chlamydia pneumoniae infection

IW Fong, B Chiu, E Viira, MW Fong, D Jang and J Mahony
Department of Medicine, St. Michael's Hospital, Toronto, Ontario, Canada.

A rabbit model was established for Chlamydia pneumoniae infection that may be helpful to understand the pathogenesis of disease in humans. Twelve, pathogen-free, 1-month-old New Zealand White rabbits were inoculated with 1.0 x 10(7) to 5.0 x 10(7) CFU of purified C. pneumoniae (ATCC strain VR 1310) via the nasopharynx (1 rabbit died immediately postinoculation, and 11 were available for study). Five controls were inoculated with the carrier buffer. Ten of the 11 study rabbits demonstrated serological evidence of acute infection (immunoglobulin G antibodies, 1:8 to > 1:16), with the weakest response at 7 days and the strongest response at 28 days, whereas none of the controls showed any seroconversion. Study animals were sacrificed in batches of three, on days 7, 14, 21, and 28, but controls were sacrificed on days 7 and 28. Two-thirds of the animals demonstrated evidence of bronchiolitis and pneumonia on days 7 and 14 and resolution by day 21. Two study rabbits demonstrated, on histology, early and intermediate lesions of atherosclerosis: one animal (day 7) showed the accumulation of foamy macrophages (fatty streak) in the arch of the aorta, and the other animal (day 14) showed spindle cell proliferation of smooth muscle cells (intermediate lesion). Focal periaortitis was seen in the same animal (day 7). C. pneumoniae elementary bodies were demonstrated by immunocytochemical stain in the lungs (n = 2), liver (n = 3), spleen (n = 5), and aorta (n = 2), one of which corresponded to the intermediate lesion. C. pneumoniae was cultured from the lungs (n = 2), liver (n = 2), spleen (n = 2), and aortic arch (n = 1). All histopathological, immunocytochemical, and cultural studies were negative in the controls. Hence, the rabbit provides a useful animal model for the study of C. pneumoniae infection and its complications, particularly atherosclerosis.


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