Upper Respiratory Infection In Cats Symptoms

Upper respiratory infections (URIs) are extremely common in cats, especially in multi‑cat households, shelters, and boarding facilities. Often compared to the human cold, these infections are typically caused by viruses (feline herpesvirus and calicivirus being the most frequent) or bacteria. While many cases are mild and self‑limiting, knowing the symptoms and when to seek veterinary care is essential for your cat’s comfort and health.

Quick Q&A: Common Questions

Question: What are the most common signs of an upper respiratory infection in cats?
Answer: The hallmark symptoms include sneezing, nasal discharge (clear to yellow‑green), conjunctivitis (red, watery eyes), and lethargy. You may also notice decreased appetite, coughing, oral ulcers, and a mild fever. If symptoms persist beyond a few days or worsen, a veterinary visit is recommended.

Recognizing the Symptoms

Cats with URIs present a constellation of signs that can vary in severity. Early recognition helps you provide timely care and prevents complications.

Respiratory Signs

• Sneezing: Often the first noticeable symptom. Sneezing may be frequent and forceful.
• Nasal discharge: Initially clear, but may become thick and coloured (yellow or green) if a secondary bacterial infection develops.
• Coughing and gagging: Less common than sneezing but can occur if the infection extends to the trachea.
• Congestion: Noisy breathing, open‑mouth breathing, or reduced airflow through the nose.

Ocular Signs

• Conjunctivitis: Redness and swelling of the membranes lining the eyelids.
• Eye discharge: Can be watery (clear) or thick (mucoid/purulent).
• Blepharospasm: Squinting or holding the eye partially closed due to irritation.

General Signs

• Lethargy: Your cat may become less active and sleep more.
• Fever: A mild increase in body temperature (above 38.9°C/102°F) is common.
• Loss of appetite: Nasal congestion reduces the sense of smell, which can suppress appetite. Oral ulcers (especially with calicivirus) also make eating painful.

Less Common Symptoms

• Oral ulcers: Painful lesions on the tongue, lips, or palate (typical of calicivirus).
• Pneumonia: In severe cases or in kittens, the infection may spread to the lungs, causing respiratory distress.

In some cats, especially those with chronic herpesvirus infection, symptoms may recur during stress. Stress management is therefore an important part of long‑term care.

Causes and Transmission

URIs in cats are most often caused by:

• Feline herpesvirus type 1 (FHV‑1): A highly contagious virus that causes severe respiratory and ocular signs. Once infected, most cats become lifelong carriers, shedding the virus during stress.
• Feline calicivirus (FCV): Another common virus, often associated with oral ulcers and lameness (limping syndrome).
• Bordetella bronchiseptica and Chlamydia felis: Bacterial agents that can cause or complicate URIs.

Transmission occurs via direct contact (nose‑to‑nose), inhalation of sneeze droplets, or contaminated objects (food bowls, bedding). Overcrowding, poor ventilation, and inadequate vaccination increase the risk.

International consensus guidelines from the AAHA/AVMA (US), CVMA (Canada), and AVA (Australia) emphasise that vaccination against FHV‑1 and FCV is the cornerstone of prevention, though it does not eliminate infection but reduces severity and shedding.

Home Care for a Cat with URIs

For mild cases, supportive care at home can help your cat recover more comfortably. However, always consult your veterinarian before starting any treatment.

• Encourage eating: Warm up canned food to enhance aroma. Offer strong‑smelling foods like tuna or chicken baby food (ensure no onion or garlic). If your cat refuses to eat for more than 24 hours, seek veterinary advice.
• Keep nasal passages clear: Use a humidifier or bring your cat into a steamy bathroom for 10–15 minutes several times a day. Gently wipe away nasal discharge with a warm, damp cloth.
• Eye care: If discharge is present, gently wipe eyes with separate clean cotton balls (one per eye) soaked in warm water or saline.
• Reduce stress: Provide a quiet, comfortable space away from other pets. Use pheromone diffusers (e.g., Feliway) if needed.
• Hydration: Ensure fresh water is always available. Some cats prefer running water from a fountain. Inappetence can lead to dehydration; consider offering low‑sodium chicken broth (no onion).

When to call the vet: If your cat stops eating or drinking for more than 24 hours, develops difficulty breathing (open‑mouth breathing, blue gums), has a fever above 40°C (104°F), or if symptoms worsen after 3–5 days, prompt veterinary intervention is needed.

What to Expect at the Veterinarian

Your vet will perform a thorough physical exam, noting temperature, respiratory effort, and oral lesions. They may recommend:

• Diagnostic tests: Conjunctival or nasal swabs for PCR or culture to identify the causative agent (especially in chronic or severe cases).
• Medications: Antiviral drugs (e.g., famciclovir for herpesvirus), topical or systemic antibiotics (if secondary bacterial infection is suspected), and eye ointments (for conjunctivitis).
• Supportive care: In severe cases, hospitalisation with intravenous fluids, nutritional support, and oxygen therapy may be necessary.

Follow your vet’s instructions carefully. Never give human cold medications or over‑the‐counter drugs to cats, as many are toxic.

Prevention

Vaccination is the most effective way to reduce the risk and severity of URIs. Core vaccines (FVRCP) protect against herpesvirus, calicivirus, and panleukopenia. Booster schedules should follow your vet’s recommendation based on lifestyle and risk factors.

Other preventive measures include:

• Minimising stress in multi‑cat households through gradual introductions and adequate resources (litter boxes, food bowls).
• Good hygiene: Wash food bowls, bedding, and toys regularly.
• Isolating any new cat for at least 10–14 days before introducing to resident pets.
• Keeping indoor cats indoors to reduce exposure to stray or infected animals.

Consult your veterinarian for a tailored prevention plan, especially if your cat has a history of recurrent infections.

Conclusion

Recognising the symptoms of an upper respiratory infection in cats, sneezing, nasal discharge, conjunctivitis, and lethargy, allows you to act quickly. With supportive home care and timely veterinary guidance, most cats recover within 1–2 weeks. By staying informed and proactive, you can help your feline companion breathe easier and stay healthier.