Feline Herpesvirus: Chronic Eye Disease and Cat Welfare

Feline herpesvirus (FHV-1) is a major cause of upper respiratory and eye disease in cats. Understanding its management is vital for the welfare of affected cats.

Key Facts

Feline herpesvirus-1 (FHV-1) causes feline viral rhinotracheitis — a major component of feline upper respiratory disease complex.
Like other herpesviruses, FHV-1 establishes lifelong latency after primary infection, with reactivation during stress causing recurrent clinical episodes.
Primary infection signs include sneezing, nasal discharge, conjunctivitis, and corneal ulcers — particularly severe in kittens.
Corneal sequestrum (dark necrotic plaques on the cornea) is a chronic FHV-associated complication causing significant eye discomfort.
Recurrent episodes are triggered by stress — rehoming, veterinary visits, new animals, or household changes all commonly cause flare-ups.
Lysine supplementation was historically recommended but is no longer supported by current evidence as a prophylactic measure.
Antiviral therapy (famciclovir oral) reduces severity and duration of FHV-1 flare-ups in cats with frequent episodes.

Welfare Considerations

FHV-1 causes genuine suffering during acute episodes — conjunctivitis, corneal ulcers, and upper respiratory inflammation are painful and distressing. Cats with chronic FHV-associated eye disease experience persistent discomfort from corneal sequestrum or recurrent ulceration. The stress-linked reactivation pattern means that any welfare stressor — moving home, introducing new animals, hospitalization — can trigger another painful episode. This creates a feedback loop where veterinary treatment (itself stressful) may trigger reactivation. Minimising stress in chronically affected cats is as important as medical management. Topical and systemic antiviral therapy during flare-ups reduces the duration of suffering. Owners of FHV-positive cats should have a treatment protocol ready so they can initiate therapy quickly when reactivation signs appear.

What You Can Do

Seek veterinary assessment for cats with recurring conjunctivitis, corneal changes, or persistent sneezing.
Ask your vet about antiviral therapy (famciclovir) for cats with frequent FHV-1 reactivations.
Minimize stress in your FHV-positive cat's environment — stability and predictable routine reduce reactivation frequency.
Apply topical ophthalmic antivirals (if prescribed) at the first signs of eye flare-ups to reduce duration.
Ensure FHV-positive cats are vaccinated against FHV-1 as part of their core vaccination schedule.
If you adopt a cat with a history of upper respiratory disease or eye problems, seek veterinary assessment early to determine if FHV-1 management is needed.