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Experimental Yersinia enterocolitica placentitis in sheep.

M J Corbel1, B Ellis, C Richardson

  • 1Ministry of Agriculture, Fisheries and Food, Central Veterinary Laboratory, Weybridge, Surrey.

The British Veterinary Journal
|July 1, 1992
PubMed
Summary

A Yersinia enterocolitica strain caused ovine abortions by infecting placentas and fetuses. The bacteria were isolated from aborted fetuses and ewe discharges, but subsequent pregnancies were unaffected.

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Area of Science:

  • Veterinary Pathology
  • Microbiology
  • Reproductive Immunology

Background:

  • Yersinia enterocolitica is a zoonotic pathogen.
  • Ovine abortions can result from various bacterial infections.

Purpose of the Study:

  • To investigate the pathogenicity of a specific Yersinia enterocolitica strain (O serogroup 6,30) in pregnant ewes.
  • To characterize the resulting placentitis and fetal infection.

Main Methods:

  • Intravenous inoculation of pregnant ewes with Yersinia enterocolitica.
  • Monitoring for abortion and fetal viability.
  • Bacteriological and histological examination of placentas, fetuses, and ewe discharges.

Main Results:

  • Infection led to placentitis, abortion, or delivery of infected lambs approximately 50 days post-inoculation.

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  • Yersinia enterocolitica was recovered from placental tissues, fetal tissues, and vaginal discharges.
  • Histopathology confirmed acute bacterial necrotizing placentitis and systemic fetal infection.

    • Conclusions:

    • Yersinia enterocolitica O serogroup 6,30 can induce abortion in sheep through severe placentitis.
    • The bacterium can be isolated from multiple sites following infection.
    • Immunity may be established, as subsequent pregnancies were successful.