Rising average temperatures in Canada are expanding the habitat of deer ticks, carriers of lyme disease, further and further into the country. This means Canadians will have to become vigilant about checking themselves for the bugs, which can easily burrow into skin undetected. If caught early lyme disease is easily treatable, and transmission can be prevented if ticks are found within 24 hours. But if undetected, the disease can lead to facial palsy, meningitis, heart problems, nerve damage and inflammation of the brain and spinal cord. The Canadian Medical Association is urging people to be careful when walking through high grass, and for doctors to watch for symptoms in their patients.