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Chlamydiae in porcine abortion

R Thoma1, F Guscetti, I Schiller

  • 1Institut für Veterinärpathologie der Universität Zürich, Switzerland.

Veterinary Pathology
|November 5, 1997
PubMed
Summary

Chlamydiae were identified in fetal swine livers, indicating they cause abortions in sows. These porcine strains are immunologically distinct from intestinal types and similar to ruminant abortigenic strains.

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Area of Science:

  • Veterinary Pathology
  • Microbiology
  • Immunology

Background:

  • Chlamydiae are known pathogens causing reproductive losses in various animal species.
  • Swine abortion is a significant concern in livestock production, necessitating identification of causative agents.

Purpose of the Study:

  • To investigate the presence and characteristics of chlamydiae in aborted fetal swine livers and lungs.
  • To determine the immunotype of identified chlamydial strains and compare them to other known strains.

Main Methods:

  • Retrospective immunohistochemical analysis of formalin-fixed, paraffin-embedded fetal swine tissues (livers and lungs).
  • Utilized genus-specific, immunotype 1-specific (Chlamydia psittaci), and C. trachomatis-specific antibodies for antigen detection.

Main Results:

  • Chlamydial antigen was detected in eight fetal livers (3.6%) from five swine abortion cases.
  • Lung tissues were negative for chlamydial antigen.
  • Five positive livers reacted with an antibody against Chlamydia psittaci immunotype 1; three did not.
  • No reactivity was observed with an antibody specific for Chlamydia trachomatis.

Conclusions:

  • Chlamydiae are identified as a cause of abortion in sows in Switzerland.
  • The identified porcine abortigenic strains are immunologically different from intestinal strains (primarily C. trachomatis).
  • These strains share immunological similarities with abortigenic chlamydiae found in ruminants.

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