This film tells the story of a group of doctors who went to Tonga to immunize the people against smallpox with an experimental vaccination device. The narrator, one of the doctors, gives a brief history of Tonga, explaining that the small population is peaceful, isolated, and has no history of smallpox. He then explains the new jet injection gun, operated by foot pedal, which is much cheaper and more efficient than standard vaccination methods. They first vaccinate the royalty, which sets an example for the rest of the people, who willingly accept the vaccinations and are pleasantly surprised by the relatively painless process. After vaccinating everyone on the main island, the doctors took fishing boats out to the smaller surrounding islands to vaccinate everyone there, too. The doctors revisited all of the patients two weeks later to test the results, which were much to the doctors' satisfaction. The narrator then explained that together, America and Tonga had taken an important step to promote the health of the world.
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