Which of the following is considered a foreign animal disease in the United States?

• A. Contagious bovine pleuropneumonia
• B. Aujeszky's disease
• C. Enzootic bovine leukosis
• D. Equine viral arteritis

Answer: (A)

Foreign animal diseases are diseases not found in the United States in domestic animals or wildlife, where their introduction could cause major economic and animal health consequences, prompting rapid federal and state response.

Contagious bovine pleuropneumonia fits this idea because it has not been detected in U.S. cattle, so its appearance would trigger strict, urgent safeguards and response actions to prevent a costly outbreak. The other diseases do not fit because enzootic bovine leukosis and equine viral arteritis are present in the United States, although they are managed under established control programs, and Aujeszky's disease persists in feral swine within the country, so it is not considered a foreign disease in this context.