Mrs Smith revisits Dr King and he reminds her that her children could have been immunised 3 year's previously. Mary and William are then taken to the surgery to test for natural immunity to the disease. Both are immune. A typical non-immune reaction is shown; a sore is seen but the film notes that this is temporary. Footage of a genuine clinic follows with children being immunised (they require 3 injections over the course of 3 weeks). They are shown having recently been immunised; they are happy and smiling. The laboratory is then visited with more shots of a technical nature showing how the samples are created. A gun is then pointed at the viewer with the message that diphtheria germs are as dangerous as getting shot at! A toy gun with a small sign saying 'toy caps', is then seen which suggests that immunisation would neutralise danger. There is a sign for the diphtheria immunisation clinic with more views of children receiving their inoculations. The closing message is 'YOU HAVE BEEN WARNED'.