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We thank Professor Peter Armitage, Dr. S. L. Katz, and Dr. E. T. C. Spooner for their advice and help. Our thanks are also due to Dr. Norman-Williams, Chief Medical Adviser to the Federal Government, Nigeria, and to Dr. S. 0. Franklin, Chief Medical Officer, Western Region, for their co-operation in the trial; to the medical and nursing staff of the children's department, University College Hospital, Ibadan; to the health sisters of the department of preventive and social medicine, University College Hospital, Ibadan; and to the health visitors of the School of Nursing, without whose assistance this investigation could not have been carried out.

Vaccination Against Measles: Part III. Clinical Trial in British Children