Montreal public health is warning of an uptick in Lyme disease in the city after officials recorded 161 cases in 2025.
That’s the highest number of cases since 2003, when Lyme infections because a notifiable disease in Quebec.
The tick-born disease is on the rise across the province, with 869 cases reported between Jan. 1 and Nov. 5, 2025.
The Quebec government says the rise in tick-related infections could be explained by climate change, as warmer weather would allow ticks to survive more easily.
Of the 161 cases reported in Montreal, the public health agency estimates that 38 percent were contracted within the city.
Health officials say people who enjoy outdoor leisure activities should be careful in endemic areas….