Association of pneumonia in foals caused by Rhodococcus equi with farm soil geochemistry.

The research explores the correlation between the geochemistry of surface soils in horse-breeding farms and occurrences of pneumonia in foals caused by Rhodococcus equi. The results show no significant association between soil factors and occurrence of the disease, indicating that it remains uncertain whether foals on a given farm have a heightened risk of developing the ailment based on these factors.

Methodology

• The research was conducted at 24 horse-breeding farms affected by Rhodococcus equi and 21 unaffected farms. These farms were located across different regions in Texas.
• Veterinary practitioners gathered surface soil samples from the areas on the farms that the foals visited most frequently.
• Various factors in the soil samples were then assayed, such as pH, salinity, nitrate, phosphorus, potassium, calcium, magnesium, sodium, sulfur, zinc, iron, manganese, and copper.
• The median values for each factor were recorded for both affected and unaffected farms and the differences were compared.

Results

• There were no significant differences detected in the soil factors between the affected and unaffected farms.
• Therefore, it was concluded that there was no specific association of these soil factors with Rhodococcus equi contamination.

Conclusions

• The surface soil factors monitored in this study were not found to be significant risk factors for pneumonia in foals caused by Rhodococcus equi.
• This implies that it remains uncertain whether foals on a given farm are at an increased risk of developing the disease based on the assessed soil factors.
• In light of the findings, the researchers noted that the data do not support amending surface soil factors (like alkalinization by applying lime) as a viable control strategy for Rhodococcus equi.