![]() Quarter Horses, other breeds, ponies, and drafts had a lower incidence rate. They also noticed an increase in PMR among Standardbreds, Tennessee Walking Horses, Thoroughbreds, Warmbloods, and stallions. The lowest the PMR has dropped since 1990 was to 0.2% in 2013. “As we looked at the most recent data from 2010 to 2015, there was a reduction in … the incidence of EPM,” he said. “The other thing that was happening during this time, we also had the approval studies FDA trials for the major drugs that were being produced and although Protazil (diclazuril) was approved in 2007, the trials were actually done from 1999 to 2001. “So likely EPM was at a higher incidence (before then),” he said, “but we really didn’t have a good diagnostic test and, so, most of those cases went undiagnosed and we didn’t particularly have treatment. “The incidence or the PMR was fairly low initially in 1990 up until about 1994,” he said, at which time the data shows a spike in cases 1995-1999, likely due to the new Western blot diagnostic tests, which had recently become available. He reflected on the legacy data, noting factors that might have contributed to trends. So, the overall PMR was 0.8% in 25 years, he said, and probably underestimated based on population. Andrews reported those teaching hospitals made 2,111 diagnoses of EPM from 263,862 accessions. So, in this study, it would be the number of EPM cases among all the veterinary teaching hospitals 1990-2015 divided by the total caseload (excluding field service cases and well-animal checks).Įighteen and nine veterinary colleges reported their EPM numbers to the Veterinary Medical Data Base (VMDB) from 1990-20 to 2016, respectively, and total caseload counts over that time. ![]() Incidence is the number of new cases of a specific diagnosis in a specific population during a specific period, divided by the total number of all diagnosed cases in that same population. “What we wanted to do in this particular study was to calculate the proportional morbidity rate (PMR), which is an indicator of incidence in a population of horses for EPM … that were presented to the veterinary medical teaching hospital over a period of time,” he said. Andrews presented the team’s research results at the Second EPM Society Workshop, held Oct. ACVIM (LAIM), LVMA Equine Committee Professor of Internal Medicine and Director of the Equine Health Studies Program at Louisiana State University School of Veterinary Medicine, in Baton Rouge, and colleagues at the University of Tennessee College of Veterinary Medicine and the Virginia Maryland Regional College of Veterinary Medicine picked the study methods back up, looking at data from 1990-2015, and surveying veterinarians in the early part of 2016.
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