I don't know about the "official" source for the US, but I can tell you that there have been 4 confirmed cases of Rabies in the last 3 weeks within a 15 mile radius of my home and the farm where I keep my horses.
Last week, just as I pulled up to the farm, I noticed my two geldings and their pasture mate, another gelding, running around each other in a tight circle. I thought they were playing.....NOT!!! They were trampling a raccoon. I went running into the field just as the final kick was given and the raccoon collapsed....dead.
The horses kept sniffing the raccoon until I was able to get them away from it. My friend came out about that time and she got a couple of trash bags to put the raccoon in to get it out of the field. I had noticed some blood on the ground but didn't think anything of it at the time.
We took all 3 horses out of the pasture and went over each of them closely, looking for bite marks. One of my boys had a bite on his fetlock. So, we put 2 horses back out into the field and I kept the one out to clean the bite.
I noticed that the 2 horses back in the field had gone back to the spot where the raccoon had died. Remembering the blood, I went back out into the field in time to see both horses eating the blood and some of the dirt!
The State Lab tested the raccoon and, luckily, this one was negative. When they called me with the results, they told me about the 4 cases (2 raccoons & 2 unvaccinated pet dogs). I had my horses' and my dogs' Rabies vaccine boostered. My friend and I also had titers pulled to check our levels since we have both had pre-exposure Rabies vaccines. I would rather be safe than sorry!
Vicky
Vicky