Ferro, P. J., Fearneyhough, M. G., Calvert, C., Neill, J. D., & Ridpath, J. F. (2016). Case report: Emergence of bovine viral diarrhea virus persistently infected calves in a semi-closed herd. The Bovine Practitioner, 50(1), 28–30. https://doi.org/10.21423/bovine-vol50no1p28-30