The prevalent explanation—it's one that's been around for a long time—is the whole area of vector-borne diseases. It's a disease carried by a mosquito, tick, or whatever. Due to climate change, we will be seeing a spread of vector-borne diseases. This is not news. Goodness, when I worked in the office of the federal Minister of the Environment in 1986, I can remember the scientists at Environment Canada telling us then that the climate crisis would involve the spread of vector-borne diseases; more malaria in places that didn't used to have malaria, dengue fever in places that didn't have dengue fever. We didn't talk about Lyme disease particularly, but it falls in that category.
Now, as Mr. Lizon has suggested, maybe there's something else at work, and we need more research to understand why the ticks are spreading and why the bacteria is prevalent on different species of ticks from what we had expected. Typically we thought it was deer ticks. Clearly, jurisdictions that thought there was no such thing as Lyme disease in their jurisdiction held to that fairly firmly until the evidence made it impossible to hold to that theory. Now they have—