Final answer:
Rhinopneumonitis is an acute upper respiratory infection caused by the Equine Herpesvirus. It primarily affects foals and is characterized by severe nasal discharge, high temperature, depression, loss of appetite, and a mild cough. Vaccination is available for prevention and control.
Step-by-step explanation:
The disease described in the question, characterized by an acute upper respiratory infection with severe nasal discharge, high temperature, depression, loss of appetite, and a mild cough, is Rhinopneumonitis.
Rhinopneumonitis is an upper respiratory infection caused by the Equine Herpesvirus (EHV) in horses. Foals are particularly vulnerable to this disease because their immune systems are still developing.
This disease can cause significant respiratory distress in affected foals and can also lead to abortion in pregnant mares. Vaccination is available to help prevent and manage the spread of Rhinopneumonitis.