Description: Segment 1 A doctor is seen examining a young boy in bed. Illustrations of a healthy mouth and a mouth infected with diphtheria bacilli are shown. An illustration of the bacilli is shown. The intertitles note that antitoxin can check the development of diphtheria if given in time. The antitoxin is shown. The process of making antitoxin is shown: bacilli are grown in broth, and are shown some days later. The use of horses in the making of antitoxin is shown and described. Time start: 00:00:00:00 Time end: 00:05:33:11 Length: 00:05:33:11 Segment 2 Blood is removed from a horse that has been given diphtheria toxin. This antitoxin blood is purified to make antitoxin. This process is shown in an animation. The antitoxin in bottled for use by physicians. Next, the processes in modern diphtheria control are demonstrated. In a dramatisation, a doctor examines a young girl who is sick in bed. He diagnoses diphtheria and cultures are taken for examination by the city health department. The next morning the cultures are examined. Time start: 00:05:33:11 Time end: 00:11:27:19 Length: 00:05:54:08 Segment 3 The health department protects the community by isolating the case. The health department nurse advises about isolation. After treatment, Mary is well again and is seen playing with her friends. Statistics are given about the efficacy of the antitoxin when given at different stages in the disease. Children are seen being immunised at one year old. Children who were not immunised at this age are shown being immunised at school. Six months after immunisation the Schick test is administered to check whether the children are now immune. The Schick test is read. The film ends with the intertitles stating that some cities have not had a diphtheria death in five years. Time start: 00:11:27:19 Time end: 00:16:33:10 Length: 00:05:05:16