A variety of ocular conditions in the cat are linked to an infection with Feline Herpesvirus-1 (FHV-1). The Feline Herpesvirus is widely distributed and it is estimated that about 90% of cats worldwide are seropositive. The virus is very common and easily transmitted among large cat groups, such as catteries, multiple cat households and boarding facilities. Most cats get infected at a very early age after maternal antibodies have waned around 8-12 weeks. After an initial infection (often clinically manifest as an upper respiratory tract disease) the virus goes dormant in neural ganglia and will persist in the affected cats for live. Stressful events will trigger re-activation of the virus causing ocular disease, such as conjunctivitis and corneal ulcerations.