Lyme disease

Prevalence

Canine Lyme Disease Increasing

Discovered in humans in 1975 in Old Lyme, Conn., and identified in dogs in 1984, Lyme disease in both people and dogs has spread rapidly because deer and mice have helped spread ticks with the infection. It is estimated that 50% of dogs are infected with Lyme Borreliosis in endemic disease areas. 4

There is no system to track the number of dogs that get Lyme disease every year, but the Public Health Agency of Canada (PHAC) just began tracking human cases nationally in 2010

Since ticks don't seem to care if they land on humans or dogs, the increase of human Lyme disease seems to apply to dogs, as well.

Know the facts about human Lyme disease

  • In 2010, Lyme disease became a nationally reportable disease in Canada.
  • Lyme disease is the most commonly reported vector-borne zoonosis in the northern temperate zone, up to 23,000 cases being recorded annually in the United States. Most of these cases occur in the north-eastern and north-central states, many of which border Canada1

Know the facts about canine Lyme disease

  • Nearly 75% of unvaccinated dogs in high Lyme disease areas will eventually test positive for canine Lyme disease, and each year more will develop the disease 3
  • Exposure to Lyme disease may be greater among dogs than humans, because dogs spend more time in backyards or roaming where they are in contact with ticks
map
Geographic area Disease threat Level of risk Your action
Endemic Infected tick population well established, putting most dogs at constant risk Nearly 75 percent of unvaccinated dogs in this area will eventually test positive for infection with the bacteria that causes Lyme disease, and each year some will develop Lyme disease 3 Talk to your veterinarian about a comprehensive tick-borne disease prevention program, including Lyme disease vaccination
Expansion Infected ticks increasing, putting dogs at risk based on lifestyle and geography Increasing trends in the number of human cases reported Talk to your veterinarian about your dogs risk level and if you need a comprehensive tick-borne disease prevention program, including Lyme disease vaccination
Isolated Infected ticks have been introduced to the area (likely by migratory birds) but populations are not established Talk to your veterinarian about a comprehensive tick-borne disease prevention program, including Lyme disease vaccination Ask your veterinarian about human and canine cases in your area. If you plan to travel with your dog to endemic or expansion areas, please talk to your vet prior to your trip.

View geographic distribution of endemic human Lyme disease areas in Canada (past, present and future), at www.phac-aspc.gc.ca.

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Lyme disease
has been
found in all 10
Canadian
provinces
The threat of Lyme disease is probably greater in dogs than in humans
Dogs will often show no signs of Lyme disease
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