A–Z topic · R
Respiratory infections
Quick answer
**Upper respiratory infections (URI)** — often called cat flu — cause sneezing, nasal discharge, eye watering and fever. Most UK cats recover with supportive care, but kittens, seniors and cats with chronic disease can become seriously ill. **Open-mouth breathing is an emergency.**
Key takeaways
- Feline herpesvirus (FHV-1) and feline calicivirus (FCV) are the most common causes. Bordetella, Chlamydia and mycoplasma can also contribute. Stress and overcrowding increase risk.
- Yes — 'cat flu' describes upper respiratory infections in cats, usually caused by viral agents. It is not influenza. Signs include sneezing, nasal discharge and eye problems.
- Yes. Viruses spread through sneezing, shared bowls and direct contact. Isolate sick cats and wash hands between handling. Vaccination reduces severity but does not prevent all infections.
The full guide
Causes, symptoms, treatment options and when to call your vet — in the complete plain-English guide.
Frequently Asked Questions
- What causes respiratory infections in cats?
- Feline herpesvirus (FHV-1) and feline calicivirus (FCV) are the most common causes. Bordetella, Chlamydia and mycoplasma can also contribute. Stress and overcrowding increase risk.
- Is cat flu the same as a respiratory infection?
- Yes — 'cat flu' describes upper respiratory infections in cats, usually caused by viral agents. It is not influenza. Signs include sneezing, nasal discharge and eye problems.
- Can cat respiratory infections spread to other cats?
- Yes. Viruses spread through sneezing, shared bowls and direct contact. Isolate sick cats and wash hands between handling. Vaccination reduces severity but does not prevent all infections.