Diphtheria are serious diseases.
Tetanus is caused by a germ that enters the body through a cut or wound. Diphtheria spreads when germs pass from an infected person to the nose or throat of others. Because of vaccination, there are many fewer cases of these diseases. Td is made for people 7 years of age and older. After a person gets the third dose, a Td dose is needed every 10 years all through life.