Upper respiratory infections are incredibly contagious, spreading easily amongst pets. The infections are caused by either viral or bacterial organisms. The most common organisms that cause upper respiratory infections in cats or dogs are:
- Feline calicivirus
- Feline Chlamydia
- Feline herpesvirus-1
- Feline reovirus
- Cowpox virus
- Bordetella bronchiseptica
- Canine influenza virus
- Canine distemper virus
- Canine parainfluenza virus infection (CPI)
- Canine adenovirus Type 2 infection
- Canine adenovirus
Often, pets contract upper respiratory infections at shelters, kennels, boarding locations, and groomers -- the crowded spaces typical in these locations, the poor ventilation, and the number of occupants creates the ideal conditions for bacteria and viruses to spread.
Even in stressful and crowded conditions, some breeds are more likely to contract an upper respiratory infection than others. For instance, Persian cats are more vulnerable to URIs because of the structure of their faces. Similarly, Pugs and other dogs with smushed, flat faces, can also have a heightened risk of upper respiratory infections.
How Do the Infections Spread?
Upper respiratory infections can spread through discharge from eyes, nose, and mouth. As with humans, one sneeze can spread germs in a wide radius. In addition to the secretions exuded from the pet, contact with items that have come in contact with the cat or dog, like a bowl, a cage, or blankets and bedding, can also transfer the infection.
Finally, even once pets are symptom-free from a viral infection, they can continue to be carriers, causing other pets in their vicinity to contract a URI. It's fairly rare for a pet to have the infection more than once, but recurrence can occur if the cat or dog is in a stressful situation.
In general, stress exacerbates the likelihood of pets contracting an infection, as it weakens their immune system. For pets, crowded situations like kennels and shelters can be an unpleasant situation, sometimes causing anxiety. And of course, the crowded conditions lend themselves to the spread of disease. Cats or dogs with upper respiratory infections should be isolated from other pets at home.
Vaccinations are one way to prevent upper respiratory infections; although they are not 100 percent effective, it’s generally recommended to provide your pet with a vaccine, particularly prior to boarding or other situations where they will be around a lot of pets. Avoiding kennels and other spots crowded with pets is another good preventative measure, although of course it will not always be possible.
This information is for informational purposes only and is not meant as a substitute for the professional advice of, or diagnosis or treatment by, your veterinarian with respect to your pet. It has, however, been verified by a licensed veterinarian for accuracy.
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