Tetanus immunisation
You should have had an initial course of three tetanus injections within a six month period and then a booster every 10 years until you have had a total of five injections. After that you will only need tetanus boosters if you receive a tetanus prone wound.

Anti-tetanus serum
If you haven't had these initial injections, or your last tetanus injection was more than 10 years ago, then as well as a tetanus injection you will need anti-tetanus serum if your wound is tetanus prone.