Epidemiologic survey of diarrhea in foals.

This research paper presents a comprehensive epidemiologic study on diarrhea in foals (baby horses), examining its causes and association with different management, health factors, and treatments.

Research Methodology

• The study was conducted prospectively, meaning the researchers planned out the recording and monitoring procedures in advance and carried out these procedures systematically.
• Data about current horse management practices on the participating farms was gathered through a survey. The focus was to comprehend the conditions and practices that could influence foal health, particularly the incidence of diarrhea.
• Additionally, a daily health record survey was maintained for the mares and their foals, providing vital data on their health statuses and any occurrences of diarrhea.
• Researchers took feces samples from 19 foals with diarrhea and 10 similar-aged foals without diarrhea. These samples were then subjected to various tests such as electron microscopy, ELISA for rotavirus, and bacteriologic culture to identify potential pathogens that might be associated with diarrhea.

Findings and Results

• The researchers found that coronavirus was present in the feces of both diarrheic and clinically normal foals, suggesting that its presence wasn’t necessarily associated with cases of diarrhea.
• Rotavirus, however, was only detected in the feces of foals with diarrhea, indicating a possible correlation between this virus and diarrhea in foals.
• Despite these findings, the study discovered no significant statistical difference in the presence of these agents (coronavirus and rotavirus) between foals with and without diarrhea.
• Remarkably, half of the 297 foals tracked in this study developed diarrhea. Interestingly, these foals did not generally show any other clinical signs of disease or illness.

Associated Factors

• The research identified that cleanliness at the time of foaling was linked to a lower incidence of diarrhea. That is, foals born in a clean environment were less likely to develop the condition.
• Conversely, the administration of prophylactic (preventative) antibiotics and vitamins to newborn foals was connected with a higher incidence of diarrhea.
• The study also found that foals borne by visiting mares (mares that are not residing permanently on the farm) experienced diarrhea more frequently, compared to foals born to resident mares, suggesting that the change in environment or associated stress factors in visiting mares could contribute to higher diarrhea incidence in their offspring.