Anywhere that's flooded recently is also at risk of an outbreak. It moves with flood water, and lepto outbreaks tend to occur after floods.
It's not just rodents. Raccoons and foxes peeing on a bush can spread it -- then your dog smells the bush, flicks its tongue at it, and bam! Infected. Clinics in my area see a lot of it.
FWIW, there's now a 7-in-1 that carries the 4-strain protection instead of the 2-strain - it's labeled as DAPPvL4 (instead of DAPPvL2). It used to be that you had to do the Lepto as a stand-alone to get the 4-strain version, but that seems to have changed in the last year.
After the August floods in Louisiana, the rescue changed its protocol to do a 2-shot lepto series for every, single dog in the rescue. We used to leave that up to adopters based on where they lived, but there was so much flood water, in so many places, that our vet thought we needed to change the policy due to increased disease risk, as vets were expecting a spike in cases. We also blasted out a warning to adopters and on social media after the flood reminding people to vaccinate or booster early. Lots of people did booster early if they were more than 6-months from their last one. So far, so good. *knock on wood*
Last edited by Magwart; 02-16-2017 at 12:15 AM.