Cat Feline Herpesvirus and Respiratory Welfare

Feline herpesvirus (FHV-1) causes upper respiratory disease that can become chronic and lifelong — welfare management focuses on reducing flare frequency and severity.

Key Facts

Feline herpesvirus type 1 infects nearly all cats at some point, with the virus persisting lifelong in a latent state in nerve tissue.
Reactivation causes sneezing, nasal discharge, eye ulcers, and conjunctivitis — triggered by stress, illness, or immunosuppression.
Eye complications including corneal ulcers can cause significant pain and, if untreated, permanent scarring affecting vision.
Lysine supplementation was historically recommended but evidence for its efficacy is now considered insufficient.
Famciclovir (antiviral) reduces replication during active flares and is the most evidence-supported medical treatment.

Welfare Considerations

Chronic feline herpesvirus causes recurring episodes of welfare-compromising illness throughout an affected cat's life. Eye ulcers from herpetic keratitis are particularly painful — cats squint, paw at their eyes, and avoid light during active corneal involvement. Stress is the primary trigger for reactivation, meaning environmental welfare improvements directly reduce disease flares. Reducing inter-cat conflict, maintaining predictable routines, and providing appropriate environmental enrichment reduce reactivation frequency as effectively as medical management alone.

What You Can Do

Seek veterinary assessment for cats with recurrent eye or nasal symptoms — FHV-1 management requires diagnosis.
Reduce stress in your household — inter-cat conflict, environmental change, and owner anxiety all trigger FHV-1 reactivation.
Ask your vet about famciclovir for cats with frequent or severe herpetic flares.
Treat corneal ulcers urgently — eye pain is severe and complications can cause permanent vision loss.