Kitty Got a Cold?


Cats, just like their pet parents, can be susceptible to colds caused by both viruses and bacteria. Feline upper respiratory infections (URI) can cause sneezing, upper airway inflammation, congestion, runny eyes and swollen conjunctiva (inner lining of the eyelids). In some cases fever, lethargy and loss of appetite are also an issue, along with eye or mouth ulcers. Some of the more common Feline URIs include:


Feline Viral Rhinotracheitis is caused by the Feline Herpesvirus Type-1. Although sneezing, nasal discharge and congestion are seen with this virus, its hallmark is the inclusion of conjunctivitis affecting the eyes of cats. The eyeball itself may also become affected, resulting in a break in the clear layer of the eyeball (the cornea) and the development of an eye ulcer. This inflammation in the lining of the eyelids causes pain, discharge and excessive blinking. It is also common to see fever, lethargy and a loss of appetite in cats with Feline Viral Rhinotracheitis.

This feline upper respiratory virus is also associated with sneezing, nasal discharge and congestion, as well as fever, lethargy and loss of appetite. Although conjunctivitis may also be seen with this virus, the hallmark of infection with calicivirus is the development of ulcers in the mouth (gums,
hard palate, tongue), or on the lips or nose in some cats. It is also possible to see joint lameness with some strains of calicivirus, while other strains that are more virulent can cause multiple organ disease.

This infection is caused by the Chlamydia bacteria known as Chlamydophila felis. Cats infected with this bacterium may have nasal and eye discharge, sneezing, conjunctivitis, fever, lethargy and a loss of appetite.

This infection caused by the Bordetella bronchiseptica bacteria can affect both dogs, cats, rabbits and, in rare cases, humans. Sometimes called kennel cough, the hallmark of this infection is a moist cough and airway inflammation. Other symptoms can include nasal discharge, sneezing, difficulty breathing, as well as — you guessed it — fever, lethargy and loss of appetite.

Treatment consists of supportive care such as:
• Keeping airways clear (the use of a humidifiermay be helpful),
• Controlling fever,
• Maintaining nutrition and hydration,
• Controlling pain and
• Antibiotic therapy for URIs caused by
bacterial infections, or viral infections that develop secondary bacterial infections. In most cases, viral URIs run their course within about three weeks. They can be harder on kittens, senior cats and those with compromised immune systems. These viruses remain in the body after recovery from symptoms. It is possible for these viruses to re-emerge at a later time and begin to shed. In the case of bacterial URIs, a longer recovery period of three to six weeks may be seen. Like viruses, some bacteria also continue to shed after recovery.

URI viruses and bacterium are transmissible to other cats too and can be passed along when a healthy cat comes into contact with secretions either directly from the infected cat or an item they have been in contact with (food dishes, toys, etc.) or sneezed on. This includes unsuspected transmission by owners from one cat to another. If your cat has been diagnosed with an URI, it is important that they are kept away from other uninfected cats. Special attention should be paid to changing your clothes and washing your hands between interactions with cats to prevent spreading infection. It is also helpful to ensure dishes, litter boxes, toys and bedding are washed between use to minimize the amount of virus/bacteria in the environment. Also, eliminating the sharing of these items with cats that are not infected is also helpful. The easiest course of action to prevent URIs in cats is to have them vaccinated
before infection becomes an issue. Discussing your cat’s risk of developing a URI and whether vaccination is appropriate with your veterinarian is key to ensuring your cat’s health.

Kristina Cooper is a Registered Veterinary Technician (RVT) and proud member of the Ontario Association of Veterinary Technicians (OAVT). She has previously worked in both small animal practice and a municipal animal shelter. With a special interest in the relationship between animal and human health, she is currently the Provincial Manager of the OAVT Public Health Rabies Response Program and an active One Health Initiative advocate. She can be reached by email at


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