Fatal

Rabies is viral disease with basically a 100% fatality rate. It's usually transmitted by a rabid animal. If you ever get bitten by an animal, visit a doctor asap.

Even if you don't show any symptoms, after an extended period of time, you still might not be safe.

Rabies sometimes has an incubation phase that'll last up to 2 years. (It could also be as short as a week) That's why you definitely want a test. Once you start showing symptoms, its time for you to write your will.