Final answer:
Pseudorabies (B) is considered a reportable swine disease because of its serious effects on pig health and agriculture. Erysipelas, Sarcoptic mange, and Pasteurella multocida while affecting swine are not typically classified as reportable diseases.
Step-by-step explanation:
In regard to the student's question about a reportable swine disease, Pseudorabies (B) is one example of a reportable disease in swine. Pseudorabies, also known as Aujeszky's disease, is caused by Suid herpesvirus 1. Although the term "rabies" is in the name, it is not related to the rabies virus. This disease can result in nervous symptoms and death in young piglets, respiratory symptoms in older swine, and can also be spread to other farm animals, causing severe problems. Because of its impact on animal health and the agricultural economy, pseudorabies are reportable to animal health authorities, meaning that any suspected cases must be disclosed to officials for further investigation and control measures.
In comparison, Erysipelas (A) is caused by Erysipelothrix rhusiopathiae, Sarcoptic mange (C) is a condition caused by mites, and Pasteurella multocida (D) can cause various conditions in animals, including atrophic rhinitis in pigs but isn't typically considered a reportable swine disease under most regulations.