Diphtheria is uasually spread by close contact with infected persons. In the UK, the combined Diptheria/Tetanus/Polio vaccine is recommended when diphtheria boosters are indicated for adults. A diphtheria booster lasts 10 years. Tetanus is a serious infection, usually contracted following contamination of wounds. In the UK, after 5 doses of vaccine, tetanus boosters are not routinely required unless travelling to areas with limited medical care. In the UK, the combined Diptheria/Tetanus/Polio vaccine is recommended when tetanus boosters are indicated. A tetanus booster lasts 10 years.