Endometrial biopsy studies of mares with contagious equine metritis 1977.

This research paper conducts a detailed microscopic study on contagious equine metritis 1977 in horses, a bacterial infection affecting the endometrium, and explores the histopathological features associated with the disease.

Research Methodology

• The researchers carried out light and electron microscopic studies on 10 field cases of contagious equine metritis 1977, and one experimentally infected pony mare.
• To contrast the identifiable features of this condition, the researchers compared them with those previously seen in most cases of acute bacterial endometritis.
• In addition, the examination also included the assessment of normal and artefactual changes commonly seen in biopsy specimens.

Findings

• The study found that there was a proliferation of luminal epithelial cells as early as 2 days after infection.
• Inter-cellular vacuolation, a pathologic process where vacuoles or empty spaces occur within a cell, of the basal region of the luminal epithelium, was seen from 2 days after infection and was recognisable for up to 37 days.
• Stromal mononuclear cell infiltrations, including many plasma cells, were observed from 2 days after infection.
• Very marked stromal neutrophilic leukocyte infiltrations were identifiable at 24 hours, but rapidly subsided despite the continued presence of the organism.

Post-Treatment Observations

• The researchers also examined post-treatment specimens taken from 9 of the mares and found a varied response in these subjects.
• Evidence of stromal mononuclear cell infiltration and basal luminal epithelial vacuolation remained even after treatment.

Conclusion

• The absence of histological evidence of acute endometritis in the presence of the causative organism suggests a possibility of a true carrier state. This means that the organism can be present without triggering the typical inflammatory responses associated with the condition.