Kevin Anderson, age 7, of Canfield, Ohio, for his question:

WHAT IS TETANUS?

Tetanus is a disease that affects the muscles. Often it is called lockjaw because severe spasms and violent muscle contractions of the jaw muscles sometimes make it hard for a victim to open his mouth.

Tetanus is caused by poisons produced by bacteria called tetanus bacilli. These germs thrive in dirt and dust and need no air to live. They enter the body through a break in the skin. Any dirt in a wound may contain tetanus germs.

About five days to five weeks after infection the symptoms usually start. The victim feels depressed, has headaches and has trouble swallowing and opening his mouth.

Tetanus can be prevented. All wounds should be cleaned thoroughly. Also, you can be immunized against infection with a special shot.