[Reactions to vaccination against yellow fever]

The frequency of reactions to vaccinations against Yellow Fever was determined in a population of 370 travellers in good health. 25% suffered from reactions, most of which were minimal, 5% were local and 22% general of which half were of the post vaccinal viral syndrome type with multiple pains and pyrexia. Strong reactions appeared in only 8 subjects (2%). Age, sex, or number of antigens injected did not cause any significant differences.