Lyme disease: Monitoring
Check the latest data on:
- number of cases
- trends over time
- geographic, seasonal, and demographic distribution of cases
On this page
Monitoring of Lyme disease in Canada
Canada monitors Lyme disease to:
- keep track of the number of human cases of Lyme disease
- identify areas where blacklegged and western blacklegged tick populations may be emerging
- identify the areas where people are most at risk of Lyme disease
To get as much information as possible, we work with:
- provincial and territorial public health authorities
- researchers and academics
Learn more about:
Monitoring of human cases
Monitoring of human cases is based on reporting of Lyme disease cases by provincial and territorial public health authorities.
Between 2009 and 2025, provincial public health units have reported 28,033 human cases of Lyme disease across Canada.
| Year | Number of cases |
|---|---|
| 2009 | 144 |
| 2010 | 143 |
| 2011 | 266 |
| 2012 | 338 |
| 2013 | 682 |
| 2014 | 522 |
| 2015 | 917 |
| 2016 | 992 |
| 2017 | 2,025 |
| 2018 | 1,487 |
| 2019 | 2,634 |
| 2020 | 1,617 |
| 2021 | 3,147 |
| 2022 | 2,525 |
| 2023 | 4,785 |
| 2024 | 5,809 |
| Preliminary 2025 | 7,105 |
Reported cases of Lyme disease include those that are locally-acquired and travel-related. The national surveillance case definition for Lyme disease, initially implemented in 2009, was revised in 2016 and in 2024. These updates may have impacted the surveillance data, and it is important to consider these changes when interpreting trends.
All provinces and territories voluntarily provided available data since 2009.
Learn more about:
Publications
- 2024
- 2023
- 2022
- 2021
- 2020
- 2019
- 2018