mice
Opossums
Raccoons are the animal most commonly implicated.
The carrier in the US is the raccoon.
For Howrse, the answer is "Possum"Equine Protozal Myeloencephalitis or EPM is spread by opossums which aquire the organizim from birds. Contrary to what some people think, it cannt be spread from horse to horse.
As odd as it sounds horses get the illness from opposoms who get it from birds.
Opossoms
I think you want to know which animal can pass the infection on to the horse. the main one is the opossum
The Animal Contract - 1991 is rated/received certificates of: Australia:G
The cast of The Animal Contract - 1991 includes: Desmond Morris as himself
Inchworms
A human can contract rabies through the bite or scratch of an infected animal, typically a wild animal like a bat or raccoon. The virus is transmitted through the saliva of the infected animal entering the bloodstream.
The protozoan parasite that causes EPM has an interesting lifecycle where it encysts in the muscle of a host animal and does no damage to that animal and is not capable of causing EPM or neurological disease in any species. It is only when muscle/tissue containing the encysted lifestage is then eaten by a possum that it then matures into the infective stage and passed in the feces of the possum and then may cause disease in horses, seals, humans, etc. The encysted stage can be found in cats, birds, armadillos and possibly other types of animals, but again it is not dangerous to horses in this stage. But this is why you should clean up dead animals as quickly as possible so that they don't serve as an infected food source for possums (who are carrion eaters) and thus infect the possums with the protozoa and continue the life cycle.