Date: July 16, 2019

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Lyme Disease

This page was reviewed or revised on Thursday, March 8, 2018 8:28 AM

What is Lyme disease?

Lyme disease is an infection caused by bacteria that can spread to humans through the bite of an infected tick.

Not all ticks carry Lyme disease. In Ontario, the tick that is known to transmit Lyme disease is the Blacklegged (Deer) tick.

Lyme Disease Fact Sheet

Where are Blacklegged Ticks in Ontario?

In Ontario, known endemic areas for Lyme disease are: Point Pelee National Park; Rondeau and Turkey Point provincial parks; Long Point peninsula, including Long Point Provincial Park and the national wildlife area; Wainfleet bog near Welland on the Niagara peninsula; Prince Edward Point; and parts of the Thousand Islands National Park.

In Ontario, risk areas for encountering a Blacklegged Tick include: locations around Kingston; along the St. Lawrence Valley to the border with Quebec and northeast towards Ottawa; western Ontario in the region of Lake of the Woods; Pinery Park on the shore of Lake Huron; and Rouge Valley region of eastern Toronto.

Symptoms of Lyme disease

Not all tick bites will result in disease and the symptoms and health effects caused by Lyme disease can vary for each person. The most common symptom is a red bull’s-eye rash that appears at the site of the tick bite between 3 and 30 days after the bite (average 10 days).

Symptoms of Lyme disease can include any of the following:

  • skin rash
  • headache
  • fever or chills
  • fatigue (tiredness)
  • spasms or weakness
  • numbness or tingling
  • swollen lymph nodes
    • oval-shaped organ found in the body, such as the armpit or stomach

Additional symptoms can include:

  • dizziness
  • abnormal heart beat
  • muscle and joint pain
  • paralysis (unable to move parts of your body)
  • mental confusion or inability to think clearly (brain fog)
  • nervous system disorders (involving the brain, nerves and spinal cord)

These symptoms can occur weeks, months or even years after the initial symptoms have cleared.

If you have been bitten by a tick and develop the symptoms mentioned, contact your doctor immediately.


If detected early, Lyme disease can usually be treated with antibiotics. Lyme disease that goes undetected can develop into a serious, chronic infection that is more difficult to treat.


Ticks are very small. They vary in size and colour depending on their age and whether they have been feeding. Ticks must feed on blood from an animal or person to live. They feed by inserting their mouth into the skin of a person or animal.

Not all ticks carry Lyme disease. The American dog tick, which is the most common tick found in Lambton County, does not carry Lyme disease. The blacklegged tick, which is not commonly found in Lambton, can spread the Lyme disease bacteria to humans.

Images of three tickets.

Blacklegged Tick
(Deer Tick)
American Dog Tick
American Dog Tick

Preventing tick bites

When entering areas with tall grass, bushes and wooded areas where ticks live, take the following precautions:

  • When walking outdoors, stick to the trails and avoid direct contact with plant growth.
  • Wear light-coloured clothing - it makes ticks easier to spot.
  • Wear long pants, a long-sleeved shirt, socks, closed-toed shoes and a hat. Tuck your shirt in your pants and pants in your socks.
  • Apply an insect repellent that contains 20%-30% DEET* to clothing or skin. Avoid your eyes and mouth area. *Health Canada and the Canadian Paediatric Society have recommended amounts. Related link: Insect Repellents
  • Put a tick and flea collar on your pet. Check them every so often to see if they have ticks. Pets can bring ticks inside your house.
  • Do a tick check on yourself, your family and your pets after being outdoors. Pay extra attention to scalp, groin and armpits.

Removing ticks

Remove any ticks that you find on the skin or clothing promptly. Ticks are most likely to spread the bacteria after being attached to your skin and feeding for more than 24 hours.

  • NEVER use a match, heat or chemicals to remove a tick.
  • Do not kill the tick before it is removed.
  • Remove the tick using tweezers. Grab the tick’s head as close to the skin as possible, pulling it straight out with steady pressure. Do not twist the tick or it may break off in the skin.
  • Clean and disinfect the bite area.

Image courtesy of Centers for Disease Control and Prevention

Submitting ticks for identification

Save the tick alive in a jar, screw-top bottle or doubled zip-lock bag. Bring it to Lambton Public Health for identification.

Please note: only Blacklegged ticks found on humans or human related cases will be submitted for identification as of April 2016.

For more information contact Lambton Public Health 519-383-8331 or toll free at 1-800-667-1839.

Related Links:

What is Tick Dragging? - Lambton Public Health

Public Health Ontario

Ministry of Health and Long Term Care

Healthy Canadians - Lyme Disease - Government of Canada

Health Care Providers

Lyme Disease Testing (Labstract)

Clinical Diagnosis and Treatment of Lyme Disease (CCDR)