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Cases of Lyme disease in Montreal highest in more than 20 years
Public health says 38% of the city’s 161 cases were likely contracted locally as Quebec reports 869 infections provincewide.
- Montreal public health officials reported 161 Lyme disease cases in 2025, the highest number recorded for the city since the disease became notifiable in 2003.
- The Quebec government attributes rising tick-related infections to climate change, as warmer weather enables ticks to survive more easily; 869 cases occurred across the province between Jan. 1 and Nov. 5, 2025.
- Public health estimates 38 per cent of the 161 local cases were contracted within the Island of Montreal, where risks were minimal 15 years ago.
- Symptoms can appear between three and 30 days after exposure, including a circular rash; Nicolas Sheppard-Jones recommends wearing long clothing and using insect repellent during outdoor activities.
- While antibiotics typically clear Lyme infections, complications can affect the heart and nervous system if diagnosed late; Dr. Sheppard-Jones encourages outdoor activities with thorough body checks after hikes.
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25 Articles
TVA NouvellesReposted by 
Le Journal de Montreal
Le Journal de MontrealWith 161 cases of Lyme disease in 2025, the Montreal region has reached an unprecedented high in 23 years, and today reveals the public health of Montreal.
·Montreal, Canada
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Last year, 161 cases were reported in Montreal, the highest number since the disease became notifiable in Quebec in 2003.
·Montreal, Canada
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161 cases were reported in Montreal last year, the highest number since 2003.
·Montreal, Canada
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Total News Sources25
Leaning Left16Leaning Right2Center6Last UpdatedBias Distribution67% Left
Bias Distribution
- 67% of the sources lean Left
67% Left
L 67%
C 25%
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