Cat Feline Herpesvirus and Upper Respiratory Care

Feline herpesvirus causes chronic upper respiratory infection in cats with lifelong latency requiring ongoing management.

Key Facts

FHV-1 infects cats for life after initial infection, establishing latency in trigeminal ganglia
Stress triggers viral reactivation and shedding causing recurrent clinical episodes
Clinical signs include sneezing, nasal discharge, eye squinting, and corneal ulcers
Corneal ulcers from FHV-1 can progress to deep dendritic ulcers threatening vision
L-lysine supplementation was historically recommended but meta-analysis found no benefit
Famciclovir is an effective antiviral for FHV-1 significantly reducing clinical severity
Minimizing stress through environmental stability reduces reactivation frequency

Welfare Considerations

Cats with FHV-1 experience recurrent bouts of nasal and eye discomfort throughout their lives. Corneal ulcers cause significant ocular pain. The stress-triggered nature creates a welfare cycle where illness causes stress which worsens illness. Environmental stability and stress reduction are genuine therapeutic interventions. Antiviral treatment during flares reduces the duration and severity of suffering for chronically affected cats.

What You Can Do

Minimize stress in cats with known FHV-1 infection through stable routines and environmental enrichment
Seek veterinary treatment including antivirals for cats with severe or corneal signs during flares
Use feline pheromone diffusers and calming supplements to reduce stress-triggered reactivation
Monitor for corneal cloudiness or squinting as signs of FHV-1 corneal ulceration needing treatment
Vaccinate cats against FHV-1 as vaccination reduces clinical severity even if not preventing infection
Avoid adding new cats during periods when your FHV-1 cat is already stressed