Lyme disease is a bacterial infection transmitted to humans by a bite from an infected blacklegged tick. In Nova Scotia, only the blacklegged tick carries the bacteria that causes Lyme disease, and not all blacklegged ticks carry the bacteria.
Ticks attach to the skin and feed on blood. In most cases, a tick carrying the bacteria that can cause Lyme disease must attach and feed for at least 24 hours before the bacteria can be transmitted.
Lyme disease cannot be transmitted by touching, kissing or being near an infected person.
How many reported cases of Lyme disease are there in Nova Scotia?
The most up to date information on the number of Lyme disease cases reported in Nova Scotia can be found in the Annual Notifiable Disease Surveillance Report available at https://novascotia.ca/dhw/populationhealth/
Where are the areas of risk for Lyme disease in Nova Scotia?
Nova Scotia has a suitable climate for tick populations. Blacklegged ticks survive best in areas that provide a moist habitat and are often found in and near wooded or forested areas, shrubs, long grass, leaf litter, urban parks and gardens. Adult blacklegged ticks are most active in the spring and fall. They remain active until the temperature is consistently below 4°C. Larvae and nymphs are most active in the spring and summer.
Black legged ticks are found throughout Nova Scotia and all areas of the province are considered as having some risk of Lyme disease. The following is a Lyme disease estimated risk areas map (and table) that uses historical Lyme disease case data and active and passive tick surveillance data to show Lyme disease risk by county.
The risk area categories are based on historical Lyme disease case data and tick surveillance (active and passive) data.
Although there are areas of the province where the risk of finding blacklegged ticks is higher, there is a chance of finding blacklegged ticks anywhere in the province.
Within all areas of the province, blacklegged ticks are found in long grass, leaf litter, shrubs, woody areas, urban parks and gardens.
|Areas of risk|
How can you protect yourself from Lyme disease?
Nova Scotians are encouraged to spend time outdoors, be active and remember to protect yourselves against tick bites, which is the best way to prevent Lyme disease.
There are several ways to prevent or reduce contact with ticks when in areas with long grass, shrubs, leaf litter, woods, urban parks and gardens:
Reduce the risk of having a tick bite:
Reduce ticks around your home:
Remove ticks as soon as possible:
You can learn some tips for protecting yourself and your family by watching these videos produced by the federal government in English or French, and a children’s video from the BC Centre for Disease Control below.
What should you do if you think you have Lyme disease?
Tick bites are often painless, and you may not know that you have been bitten. Symptoms for Lyme disease typically appear 3 to 30 days after you have been bitten and may include any of the following:
More severe symptoms (experienced weeks to months after a tick bite and no antibiotic treatment taken) may include but are not limited to:
If you have recently been in a grassy or wooded area and have symptoms suggestive of Lyme disease, especially if they include a bull’s eye rash, you should seek prompt medical attention.
The following pictures show examples of this rash:
A bulls-eye rash (Erythema migrans) is a typical symptom of Lyme disease.
The rash associated with Lyme disease is not always in the typical bulls-eye shape.
Photos reproduced with permission from Dr. John Aucott, Lyme MD, Lyme Disease Research Foundation
How do you identify a blacklegged tick?
This chart shows what different types of ticks look like, including dog ticks and blacklegged (deer) ticks which look similar and are both present in Nova Scotia.
The image below shows a comparison between the blacklegged tick and a dog tick.
Top row: nymph, male and female blacklegged ticks. Bottom row: male and female dog ticks. The blacklegged tick does not always have black coloured legs. Dog ticks usually have white or silver coloured spots.
Photo reproduced with permission from the Public Health Agency of Canada
Where can you find more quality information on Lyme disease?
Here are some reliable sites that can help answer your questions:
Are there other tick-borne diseases?
Other bacteria or viruses carried by blacklegged ticks can cause Human Granulocytic Anaplasmosis (HGA), Borrelia miyamotoi, Babesiosis, and Powassan virus disease. These bacteria and viruses have been found infrequently in ticks or small mammals in Nova Scotia and there have been two cases of Human Granulocytic Anaplasmosis in humans. These tick-borne diseases can be prevented by following the same prevention measures as described above for Lyme disease.
Protect Yourself from Tick Bites:
Lyme disease stats in annual Notifiable Diseases Report