Rabies travels through the body though, it’s not just in one aspect of the body. That’s why people often say that, if you get bit in the foot, you have a longer time to react in time than if you get bit somewhere like in the neck. The death comes when the virus’ influence reaches the brain, after which it’s sadly too late. So without a doubt there is more that could spread it than saliva, we just don’t get exposed to most other bodily fluids under normal circumstances.