Feline Upper Respiratory Infections (URI) are incredibly common—especially in shelter environments where many cats have unknown health histories. Much like a human cold, URI typically causes mild, temporary symptoms and often resolves on its own with supportive care.
This guide will help you understand what to expect, what to watch for, and when it’s time to seek veterinary care.
What Is a Feline Upper Respiratory Infection?
URI is an infection of the sinus and nasal passages, usually caused by viruses. While secondary bacterial infections can occur, the core illness itself is viral—which means antibiotics aren’t usually curative. Recovery comes primarily from rest, hydration, and the cat’s own immune system.
Common symptoms include:
- Sniffling and sneezing
- Watery or mucous discharge from the eyes or nose
- Mild lethargy
- Decreased appetite
Most cats experience symptoms for one to three weeks, though this varies based on age, stress levels, and overall health.
When URI Becomes More Serious
While most cases remain mild, some can progress into secondary bacterial infections. Affected cats may also stop eating or drinking enough, which can lead to dehydration and require medical care.
In these situations, always seek veterinary care which may include fluids, medication, or hospitalization, especially if the cat is struggling to breathe or is becoming increasingly lethargic.
How Could URI Impact My Household?
URI is highly contagious to other cats, but thankfully, vaccines for the most common feline upper respiratory viruses are available and most resident felines can be vaccinated as part of standard veterinary care. However, no vaccine is 100% protective, so it’s important to take precautions:
- Isolate any new arrivals for 8–10 days after adoption, both to reduce stress and to watch for developing symptoms.
- Wash your hands after handling a sick cat.
- Keep symptomatic cats separate from other felines until they recover.
The good news?
Most feline upper respiratory viruses are not contagious to humans or other animals. Once in a calm, stable home environment, cats with URI tend to recover more quickly and show fewer symptoms than those in a busy shelter setting.
Most importantly: cats with URI still make amazing companions. Their symptoms are temporary; their love is not.
When Should You Contact a Veterinarian?
Many cats with mild URI recover within one to two weeks with quiet rest and supportive care. However, some signs indicate your cat needs extra help. Contact your veterinarian if you notice:
- Not eating for more than 24 hours
- Green or yellow nasal or eye discharge with redness and/or swelling. Warm compresses can help soothe irritated eyes and soften dried discharge. Gently clean around the eye with a warm, damp cloth; antibiotics (oral or eye drops) may be prescribed by your veterinarian for relief of severe symptoms.
- Difficulty breathing, open-mouth breathing, or audible wheezing
- Severe lethargy, depression, or unusual unresponsiveness
- Vomiting or diarrhea lasting more than 24 hours
Final Thoughts
URI can be concerning, but in most cases, it’s manageable and temporary. With simple precautions and attentive care, cats experiencing URI can transition smoothly into loving homes—and often improve rapidly once they settle into a less stressful environment.
If you have concerns about a cat in your home or are considering adopting a cat currently experiencing URI, you can chat with your veterinarian. For advice, your adoption team is always here to help.
