Distemper epidemic

There is an epidemic of distemper that has killed hundreds of raccoons and skunks in the Greater Toronto Area since May 2009.

This form of distemper can affect dogs; other diseases called distemper affect cats, horses and seals.

Puppies and dogs usually become infected through airborne exposure to the virus contained in respiratory secretions of an infected dog or wild animal. Outbreaks of distemper tend to be sporadic. Because canine distemper also affects wildlife populations, contact between wild and domestic canids may facilitate spread of the virus.

The disease is not transferable to humans. But unvaccinated dogs are at high-risk for the disease that kills quickly. Puppies and older dogs are more susceptible to the viral disease, similar to measles, which is spread by food, water, urine and feces.

Vaccination and avoiding contact with infected animals are key elements of canine distemper prevention.

Vaccination is important. Young puppies are very susceptible to infection, particularly because the natural immunity provided in their mothers' milk may wear off before the puppies' own immune systems are mature enough to fight off infection. If a puppy is exposed to canine distemper virus during this gap in protection, it may become ill. An additional concern is that immunity provided by a mother's milk may interfere with an effective response to vaccination. This means even vaccinated puppies may occasionally succumb to distemper. To narrow gaps in protection and optimally defend against canine distemper during the first few months of life, a series of vaccinations is administered.

Until a puppy has received its complete series of vaccinations, pet owners should use caution when taking their pet to places where young puppies congregate (e.g. pet shops, parks, puppy classes, obedience classes, doggy daycare, and grooming establishments). Reputable establishments and training programs reduce exposure risk by requiring vaccinations, health examinations, good hygiene, and isolation of ill puppies and dogs.