Great post Dr. Lee and thank you for taking the time to share that with all of us.
The area we live in, in Ontario, normally doesn't have problems with ticks and Lyme disease. However, our vet is also testing for Lyme disease along with heartworm before prescribing "my girls" usual doses of Revolution for the upcoming season.
I never even thought to ask our vet "why" he is now testing for Lyme as they haven't done that here before.
Anyway, thanks again for the info., it's much appreciated.