An expert lectures to a room of students about a successful immunisation programme in Canada. Both cases and deaths decreased dramatically as a result of the programme, with no deaths at all since 1930. The narrator says that a similar programme has begun in Britain. A laboratory produces the toxoid, packages it and sends it to local health authorities. A doctor is shown giving the injection in his surgery. A large group of children is shown waiting for their vaccine at a school. A young girl is injected and smiles. The narrator stresses that the parents need to help and cooperate to protect their child. A mother talks to a GP and looks at a consent form. Children are seen eating together at school, and the narrator says that diphtheria can be stamped out by prompt action.