Tetanus (lockjaw) is a serious disease that can happen if dirt with the tetanus germ gets into a cut in the skin. Tetanus germs are found everywhere, usually in soil, dust, and manure. It does not spread from person to person. Tetanus causes cramping of the muscles in the neck, arms, leg and stomach and painful convulsions which can be severe enough to break bones. Even with early treatment, tetanus kills two out of every 10 people who get it.