Mrs. Butlerasked the Minister of Health whether, regarding the effect of Salk vaccine upon paralytic poliomyelitis in the year 1961, he will state the number of children, aged 15 years and under, who received the first injection, the percentage of these who returned for a 7W second injection, and the percentage of the latter who returned for a third injection.
§ Mr. PowellSeparate information about children under 15 is not available. By the end of 1961, 10,423,000 persons then under 19 years of age had had a first dose of Salk vaccine and of these over 99 per cent. a second. About 90 per cent. of vacinated persons of all ages had had third doses.