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Pulmonary hypertension syndrome in broilers caused by Enterococcus faecalis.

J D Tankson1, J P Thaxton, Y Vizzier-Thaxton

  • 1Department of Poultry Science, Mississippi State University, Mississippi State, Mississippi 39762, USA. pthaxton@poultry.msstate.edu

Infection and Immunity
|September 13, 2001
PubMed
Summary
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Enterococcus faecalis infection in broiler chicks caused significant heart abnormalities, specifically a cavity in the right ventricle. These findings suggest the bacteria can induce pulmonary hypertension in poultry.

Area of Science:

  • Veterinary Pathology
  • Poultry Science
  • Microbiology

Background:

  • Enterococcus faecalis is a common bacterium in poultry.
  • Cardiac disease can impact broiler health and performance.
  • Understanding disease mechanisms is crucial for flock management.

Purpose of the Study:

  • To investigate the cardiac effects of Enterococcus faecalis in broiler chicks.
  • To determine if E. faecalis infection causes pulmonary hypertension.
  • To evaluate the impact of different administration routes and housing conditions.

Main Methods:

  • Broiler chicks were inoculated with varying doses of E. faecalis via intra-abdominal or intravenous routes.
  • Birds were housed communally or in isolation.
  • A scoring system quantified ventricular abnormalities in hearts.

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  • Control groups received no bacterial challenge.

    • Main Results:

    • 93% of challenged birds developed a ventricular cavity, compared to 5% in controls.
    • Average heart scores were significantly higher in challenged birds (3.1) versus controls (0.20).
    • Housing conditions and administration routes did not significantly alter the observed heart pathology.

    Conclusions:

    • Enterococcus faecalis challenge induces significant cardiac lesions in broiler chicks.
    • The observed ventricular cavity suggests E. faecalis infection leads to pulmonary hypertension.
    • Both intra-abdominal and intravenous inoculation are effective in causing pathology.