Potential disease threats are many. Although the animal disease picture for Iowa is reasonably bright, we must continue working to control some well-known diseases as well as to be on the lookout for new diseases.
Herrick, John B.
"Livestock Diseases -1953,"
Iowa Farm Science: Vol. 7
, Article 7.
Available at: https://lib.dr.iastate.edu/farmscience/vol7/iss7/7