There is a human rabies vaccination, animal control officers, veterinarians and other high-risk individuals are often vaccinated. Since all dogs and many cats are (or should be) vaccinated for rabies, the risk of most people coming in contact with a rabid animal is slim. Horses, sheep, cattle and goats can all be vaccinated if the owner chooses to do so, and if rabies were diagnosed in one of my herd animals I would be breaking out the vaccine for the rest.
Since your level of immunity to diseases can vary throughout your life, especially decreasing when you are elderly, retreatment seems wise if reexposed to a terrible and untreatable disease like Rabies.