Feline Chronic Upper Respiratory Infection: Welfare Management

Key Facts

• Feline herpesvirus-1 (FHV-1) and feline calicivirus (FCV) establish lifelong infection after initial exposure
• Stress reliably triggers viral recrudescence in FHV-1-infected cats, causing recurrent respiratory signs
• Chronic rhinitis leads to turbinate bone destruction, creating a cycle of secondary bacterial infection
• Lysine supplementation was previously recommended but evidence now does not support its efficacy
• L-lysine, antiviral therapy with famciclovir, and stress reduction form the current welfare-based approach

Welfare Considerations

Chronic upper respiratory infections create persistent low-grade welfare suffering. Cats with significant chronic rhinitis breathe noisily, have reduced smell (critical for appetite and food enjoyment), and experience recurrent episodes of overt illness. The loss of olfactory function is particularly impactful in cats — anorexia and food rejection are common. Stress management is central: FHV-1 reactivation is triggered by stress, so minimizing environmental stressors (new pets, changes, conflict) directly reduces disease frequency. Famciclovir antiviral therapy is increasingly used for severe or refractory cases.

What You Can Do

• Minimize known stress triggers for chronically affected cats — maintain routine and environmental stability
• Use HEPES or Feliway diffusers to reduce stress-driven viral reactivation
• Ensure chronically affected cats are eating by warming food, offering strong-smelling varieties, and hand-feeding if needed
• Discuss famciclovir treatment with your vet for cats with frequent or severe herpesvirus episodes
• Keep vaccinations up to date — vaccination reduces disease severity even if it cannot prevent infection