“Efficacy of a Non-Adjuvanted, Modified-Live Virus Vaccine in Calves With Maternal Antibodies Against a Virulent Bovine Viral Diarrhea Virus Type 2a Challenge Seven Months Following Vaccination”. 2010. The Bovine Practitioner 45 (1): 23-31. https://doi.org/10.21423/bovine-vol45no1p23-31.