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Experimental chlamydial pneumonia in pigs.

J W Harris, A R Hunter, D A McMartin

    Comparative Immunology, Microbiology and Infectious Diseases
    |January 1, 1984
    PubMed
    Summary

    A study investigated Chlamydia psittaci in pigs, finding it causes pneumonia. This research is crucial for understanding chlamydial infections in swine and preventing disease spread.

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    Area of Science:

    • Veterinary Pathology
    • Microbiology
    • Animal Science

    Background:

    • Naturally occurring chlamydial disease in British pigs is unconfirmed, despite serological evidence of exposure.
    • Chlamydia psittaci is a known pathogen in various animal species.

    Purpose of the Study:

    • To determine if an ovine isolate of Chlamydia psittaci can induce disease in pigs.
    • To characterize the clinical and pathological outcomes of experimental Chlamydia psittaci infection in pigs.

    Main Methods:

    • Pigs were intratracheally inoculated with Chlamydia psittaci (28/68) isolated from ovine pneumonia.
    • Clinical signs, including pyrexia and respiratory rate, were monitored.
    • Histopathological examination of lung tissues was performed at different time points.
    • Chlamydial organisms were re-isolated from infected tissues.

    Main Results:

    • Intratracheal inoculation of Chlamydia psittaci caused transient pyrexia, increased respiratory rates, and inappetance in pigs.
    • Histopathology revealed acute exudative and later proliferative inflammatory reactions in the lungs.
    • Lung damage correlated with inoculum concentration, but clinical and histological signs remained consistent.
    • Chlamydial organisms were successfully recovered from lung tissues.

    Conclusions:

    • Chlamydia psittaci, an ovine isolate, can experimentally induce pneumonia in pigs.
    • The findings highlight the potential for cross-species transmission and the need for surveillance of chlamydial infections in swine.
    • Lung tissue is the primary site for Chlamydia psittaci replication and pathogenesis in pigs.

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