Cat Chronic Upper Respiratory Infection Management

Chronic upper respiratory infections (URI) affect many cats, particularly shelter cats and those infected with feline herpesvirus. Long-term management improves comfort and reduces recurrence.

Key Facts

Feline herpesvirus (FHV-1) infects an estimated 80% of cats and can cause lifelong latent infection
Stress triggers viral reactivation, causing recurrent episodes of sneezing, nasal discharge, and eye irritation
L-lysine supplementation was long recommended but research now suggests it is ineffective and possibly harmful
Antiviral drugs including famciclovir can reduce severity and duration of active outbreaks
Environmental modifications that reduce stress - including stable routines and enrichment - reduce recurrence frequency

Welfare Considerations

Cats with chronic URI experience recurrent discomfort including nasal congestion, painful eyes, and fatigue during flares. Sneezing fits and ocular discharge are distressing and impair normal social and exploratory behavior. Management focuses on reducing stressors that trigger recurrence, treating active outbreaks with antivirals, and supporting immune function through optimal nutrition. The widespread but now-disproven use of L-lysine represents a cautionary tale about the importance of evidence-based feline medicine.

What You Can Do

Discontinue L-lysine supplementation if currently using it - current evidence does not support its use
Discuss famciclovir as an antiviral option with your vet for cats with frequent or severe outbreaks
Minimize environmental stressors including litter box conflicts, unpredictable schedules, and multi-cat tension
Keep vaccination current - FVRCP vaccine reduces severity of herpesvirus outbreaks