Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Tetanus ?
    ### Response:
    Tetanus is a serious illness caused by Clostridium bacteria. The bacteria live in soil, saliva, dust, and manure. The bacteria can enter the body through a deep cut, like those you might get from stepping on a nail, or through a burn.    The infection causes painful tightening of the muscles, usually all over the body.
    