Comment on History of rat control in AlbertaparentComments−tristor1yThis section of the linked article was in the context of the 1950s prior to the introduction of this invasive species of rat to Alberta. So, yes, at that point in time nobody had been exposed to them, because they didn't exist there.
Comments
This section of the linked article was in the context of the 1950s prior to the introduction of this invasive species of rat to Alberta. So, yes, at that point in time nobody had been exposed to them, because they didn't exist there.