Foal-Level Risk Factors Associated With Development of Rhodococcus equi Pneumonia at a Quarter Horse Breeding Farm.

The research article focuses on assessing the risk factors at the foal level that are correlated with the development of Rhodococcus equi pneumonia at a Quarter Horse breeding farm in Texas, experiencing regular occurrences of the disease.

Overview of the Research

• The issue of Rhodococcus equi pneumonia in horse breeding farms appears to vary; some farms experience it as an endemic problem while others either deal with it sporadically or do not encounter it at all.
• Out of the foals existing in farms where the disease is endemic, only a certain fraction exhibit clinical signs of the pneumonia.
• This study aims to fill a gap in existing research, where scarce evidence is available concerning the foal-level risk factors that contribute to the development of R. equi pneumonia.

Methodology of the Study

• A retrospective cohort study was conducted using data collected from foals born on the farm between January 2009 and December 2011 and meeting the inclusion criteria.
• Data regarding the dams (mother horses), foals, and their health were gathered from all the foals born during this period.
• Independent variables were subjected to logistic regression while controlling for the effect of the year to determine the risk factors to the development of R. equi pneumonia.

Findings of the Study

• A total of 787 foals born on the farm were taken into account for the study. Out of these, 209 (approximately 27%) developed R. equi pneumonia.
• The study found that the cumulative incidence of the disease on the farm varied significantly from year to year.
• A startling revelation was that the foals diagnosed with a prior morbidity, or diseases other than R. equi, were less likely to subsequently develop R. equi pneumonia.