lower monthly seroprevalences ranging from 6 to 37%. The difference in temporal seroprevalence can be explained by the successful reduction of S. neurona infection in foals receiving daily diclazuril at a low dose.
Acknowledgments Conflict of Interest
This study was supported by a grant from The Cen- ter for Equine Health, University of California, School of Veterinary Medicine at Davis and Merck Animal Health.