Cat Chronic Upper Respiratory Disease Management

Chronic upper respiratory disease in cats, often resulting from herpesvirus or calicivirus infections acquired in early life, causes recurring misery and requires careful long-term management.

Key Facts

Feline herpesvirus-1 (FHV-1) causes lifelong latent infection; stress triggers recrudescence in around 45 percent of carriers
Calicivirus strains vary widely in virulence; some cause mild sneezing while others cause severe oral ulceration
Chronic rhinitis can follow viral damage to turbinate bones, creating a permanent structural deficit
Mucopurulent nasal discharge, conjunctivitis, and nasal congestion are hallmark signs of recurrent disease
L-lysine supplementation was once widely recommended but current evidence does not support its efficacy for FHV-1
Antiviral famciclovir is the most evidence-based systemic treatment for severe FHV-1 flare-ups

Welfare Considerations

Cats with chronic upper respiratory disease experience repeated cycles of discomfort, including nasal congestion that impairs their ability to smell and thus reduces appetite, painful eye inflammation, and sinus pressure. The disease has a major impact on quality of life and can lead to significant weight loss during flare-ups. Stress is a major trigger, making management of the home environment crucial. Affected cats may benefit from environmental enrichment, reduced stressors, and regular veterinary monitoring to catch secondary bacterial infections early. Humidification of the environment can ease nasal congestion during acute episodes.

What You Can Do

Vaccinate cats against FHV-1 and calicivirus — vaccines do not prevent infection but reduce severity significantly
Create a low-stress home environment with stable routine and adequate resources to minimise herpesvirus recrudescence
Use a warm steam humidifier in the room where an affected cat rests during flare-ups to ease congestion
Consult your vet about famciclovir if flare-ups are frequent or severe, as it has good evidence for FHV-1