Rabies is a serious viral disease that affects the nervous system of mammals, including humans. It is usually transmitted through the bite of an infected animal, such as a dog or bat. Once symptoms appear, rabies can be almost always fatal, making prevention through vaccination and prompt medical treatment essential after exposure. The virus travels through the body via the nervous system, leading to symptoms like confusion, agitation, and paralysis. If someone is bitten by an animal that may have rabies, they should seek medical help immediately. Vaccines can effectively prevent the disease if administered soon after exposure.