Equine Rhinopneumonitis
(EHV-1 and EHV-4)

Disease Overview

Viruses that are prevalent in horses and can cause outbreaks of respiratory disease.

Merck Animal Health Solutions

For Equine Rhinopneumonitis (EHV-1 and EHV-4)

Clinical Signs

Typical signs of equine herpesvirus respiratory disease include fever, congestion, cough, loss of appetite, nasal and eye discharges, fatigue, and swollen lymph nodes. An animal’s first exposure to the disease generally produces more severe signs, whereas later exposures cause mild or inapparent infections. Secondary bacterial infections can occur and should be suspected when fever persists beyond a week, the nasal discharge becomes thick and yellow instead of watery, or the cough worsens.