Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
Bovine virus diarrhea (BVD) was first recognized in 1946 in the United States and described as an "X" disease of cattle in the same year in Canada. It was reported in Sweden in 1948. In 1953, it was reported by Ramsey and Chivers as a mucosal disease.
Groth, Randy and Sexton, J. W.
"Clinical Review of Bovine Virus Diarrhea and Vaccination Related Problems,"
Iowa State University Veterinarian: Vol. 43
, Article 7.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol43/iss2/7