Proliferative enteropathy in a foal caused by Lawsonia intracellularis-like bacterium.

The research article discusses a case study of a 5-month-old foal suffering from proliferative enteropathy (affecting the intestine) caused by a bacterium named Lawsonia intracellularis. This disease, encountered in several animal species, involves an abnormal increase in certain cells inside the ileum and colon. The article further explores the diagnostic methods, observations, and histopathology of the affected foal.

Detailed Explanation

The scientific paper dives into the study of proliferative enteropathy, a disease found in various animal species including pigs, dogs, foals, foxes, and rabbits, among others. It’s highlighted that:

• This disease is identified by a peculiar growth of epithelial cells in ileum and colon, and is associated with intracellular bacteria similar to Campylobacter species.
• The researchers carried out a case study on a female foal presented at the University of Kentucky, Livestock Disease Diagnostic Center, with anorexia, lethargy, and severe diarrhea.
• The foal had not previously received any treatment. Upon examination during necropsy, the researchers found that the foal was malnourished and showed signs of muscle atrophy. The illness was localized to the small intestine, specifically the jejunum and ileum.

Diagnostic Details

The researchers proceeded with further diagnostic processes:

• Samples from various parts of the foal’s body were taken and placed in neutral buffered formalin for microscopic analysis.
• Under histopathological examination, the mucosa of the affected areas was found to be thickened and populated by immature epithelial cells.
• The researchers also discovered small curved bacteria within the cells of the affected tissues when stained with Warthin-Starry method. These observations were corroborated by electron microscopic examination.
• Additionally, the researchers did not observe any significant lesions in other tissues.

Research Analysis

The researchers performed further examination and analysis:

• Deparaffinized and rehydrated tissue samples were incubated with Lawsonia intracellularis-specific monoclonal antibody, revealing the presence of the bacteria in the cytoplasm of epithelial cells from the affected crypts.
• No immunostaining, which would indicate the presence of L. intracellularis, was found in the normal sections of foal intestines.
• DNA was extracted and examined using a PCR amplification method; results confirmed the presence of the L. intracellularis disease.

The paper concludes that proliferative enteropathy in this foal was indeed caused Lawsonia intracellularis. This study expands the understanding of this intestinal disease across multiple species, and provides further evidence for the role of L. intracellularis as its causative agent.`