Common ticks in Canada

In Canada, we have approximately 40 species of tick, but fortunately for us humans, only a few of them can transmit Lyme disease.

Below is a quick guide to some of the most common ticks in Canada.

Please note: All tick images found on this website were kindly provided by the University of Alberta, and are reproduced here with permission. Please visit the U of A’s website for additional information and more detailed image galleries.

Although commonly found in wooded areas, ticks can be found pretty anywhere because they are carried by the birds and other animals they feed on.

Deer Tick

The official common name for a tick often suggests that it parasitizes a specific animal host (‘deer tick’, ‘dog tick’, ‘cattle tick’, etc). However, with rare exceptions, most tick species willingly suck blood from almost any animal they encounter

Western Black-Legged Tick

The Western black-legged tick (Ixodes pacificus) is the second most common Borrelia-carrying tick in Canada. As its Latin name suggests, this tick is found mainly on the Pacific coast. View top and bottom aspect of tick.

Ixodes angustus (no common name)

Ixodes angustus tick, known Lyme disease vector

Although this tick’s ability to transmit Lyme disease has been debated, recent lab experiments have demonstrated that it can transmit Borrelia burgdorferi and B. bissettii. So if bitten by this tick, it’s still very important to be treated immediately.

Other common ticks

The Lone Star Tick

Although the Lone Star Tick (Amblyomma americanum) has been shown to transmit Lyme borreliosis (Borrelia americana and Borrelia andersonii), it can transmit other infections such as Ehrlichia and Tularemia.

In addition, victims bitten by the Lone Star Tick will occasionally develop a circular rash, similar to the rash of early Lyme disease. The rash may be accompanied by flu-like symptoms, and this condition has been named “Southern Tick-Associated Rash Illness” (STARI). STARI is treated with oral antibiotics. Newer research is now associating a Lone Star Tick bite to a mammalian meat allergy.

American Dog Tick

The American Dog Tick (Dermacentor variabilis) is also a common tick in Canada, and can be found from Saskatchewan east to the Atlantic Provinces. This tick can transmit Rocky Mountain Spotted fever and Tularemia, but is not normally associated with Lyme disease.

Brown Dog Tick

The brown dog tick (Rhipicephalus sanguineus) has been shown to carry Borrelia, but their ability to transmit the bacterium to humans is still in question. The brown dog tick can transmit Rocky Mountain Spotted Fever.

Rocky Mountain Wood Tick

The Rocky Mountain wood tick (Dermacentor andersoni) is known to transmit Rocky Mountain Spotted Fever, Tularemia, Colorado Tick Fever, and is a major cause of tick paralysis. View top and bottom aspects of tick.

Relative size between species of ticks…