Symptoms and Treatment of Feline Upper Respiratory Infections (URI)

Your cat’s sneezing, eye discharge, or congested breathing often point to feline herpesvirus or calicivirus, causing 90% of URI cases. Watch for thick yellow-green mucus, fever over 103°F, or refusal to eat. Treat with Clavamox for bacterial infection, use saline drops for nasal clearance, and offer strong-smelling wet food to encourage appetite. Medicated drops like tobramycin help with eye issues, while famciclovir may be needed for severe herpes outbreaks-knowing when to escalate care makes all the difference.

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Notable Insights

• Feline URI is commonly caused by herpesvirus and calicivirus, which spread through direct contact or contaminated objects.
• Key symptoms include sneezing, nasal and ocular discharge, oral ulcers, fever, and reduced appetite.
• Kittens, seniors, and immunocompromised cats are at higher risk for severe illness and complications.
• Treatment often involves antibiotics, antivirals, eye medications, and supportive care like hydration and nutritional support.
• Seek veterinary care if symptoms persist beyond 10 days, breathing is labored, or the cat stops eating.

What Causes Feline Upper Respiratory Infection (URI)?

While most feline upper respiratory infections (URIs) stem from just two main culprits, it’s important to know that feline herpesvirus-1 (FVR) and feline calicivirus (FCV) together cause about 90% of cases, so protecting your cat starts with understanding how these viruses spread and behave. These viral infections spread through direct contact or nasal secretions, and feline herpesvirus can go into latency and reactivation, flaring up during stress. Meanwhile, about half of cats infected with feline calicivirus become carriers, shedding virus even when healthy. Bacterial infections like Chlamydophila felis and Bordetella bronchiseptica add to the risk, especially in multi-cat homes. All these pathogens survive on contaminated objects-bowls, bedding, toys-so cleaning is essential. You’re not just managing illness; you’re preventing repeat outbreaks with smart hygiene, vaccination, and stress reduction.

What Are the Symptoms of URI in Cats?

When your cat’s fighting a URI, you’ll likely notice sneezing, stuffy breathing, and goopy discharge from the eyes or nose-sometimes clear at first, later turning thick and yellow-green if a bacterial infection sets in. Nasal congestion makes breathing loud and labored, while conjunctivitis causes red, puffy eyes with watery or pus-like ocular discharge. You might also see nasal discharge that crusts around the nostrils, making it hard for your cat to smell food. If it’s a calicivirus strain, oral ulcers can develop, causing drooling and pain. Your cat may run a fever, feel lethargic, lose interest in meals (anorexia), or have swollen lymph nodes under the jaw. These signs often appear together, especially in multi-cat homes or stressed cats. Kittens and older cats are more vulnerable to severe symptoms, including persistent sneezing and breathing trouble.

When Should You Take Your Cat to the Vet for URI?

How do you know when a sniffle becomes something serious? If your cat has a feline upper respiratory infection (URI), watch for warning signs. Persistent nasal discharge or ocular discharge, especially if thick and yellow-green, could mean a worsening respiratory infection in cats. Seek help if symptoms last over 10 days or you notice corneal ulcers, common with feline herpesvirus. Labored breathing, fever above 103°F, or refusal to eat calls for immediate vet care. Kittens, seniors, or cats with FIV/FeLV need prompt attention at the first URI sign. Dehydration and drooling from painful oral ulcers also demand urgent intervention. Supportive care helps, but when symptoms escalate, early veterinary evaluation prevents complications like pneumonia. Don’t wait-your cat’s recovery depends on timely action.

What Are the Treatment Options for Feline URI?

You’ve spotted the warning signs and taken your cat to the vet-now it’s time to focus on what comes next. Treatment often includes broad-spectrum antibiotics like Clavamox or doxycycline to prevent secondary infections, even if the primary cause is viral, like feline herpesvirus. If your cat has severe herpesvirus symptoms, antiviral medications such as famciclovir may help. Medicated eye drops-tobramycin or Terramycin-tackle conjunctivitis and eye discharge. Supportive care is essential: maintain hydration, offer strong-smelling wet food for nutritional support, and consider nebulization or saline drops to clear nasal passages. Anti-inflammatory drugs like Onsior can ease fever and mouth pain from calicivirus. At-home care, combined with vet guidance, speeds recovery and keeps your cat comfortable.

On a final note

Keep your cat’s URI symptoms-like sneezing, eye discharge, and lethargy-in check by acting fast. Most cases need vet-prescribed antivirals or antibiotics, like doxycycline, plus supportive care: warm broth, hydration, and lysine supplements (500 mg daily). Use saline drops for runny noses, and clean eyes with sterile pads. A warm, quiet space helps recovery. Always isolate sick cats and sanitize food bowls at 160°F to prevent spread.