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I googled it just to be sure and this is what I found:

Answer: Any mammal can get rabies. However, the chance of rabies in an opossum is EXTREMELY RARE. This may have something to do with the opossum's low body temperature (94-97º F) making it difficult for the virus to survive in an opossum's body.

So they can have rabies in the end, but it's so rare that the possibility is negligible.