§ Mr. Viantasked the Minister of Health to what extent the outbreak of disease in monkeys at the Beckenham Laboratories has delayed issue of poliomyelitis vaccine.
§ Mr. Walker-SmithThis has so far delayed the testing process and the issue of vaccine from one manufacturer by about six weeks.
§ Mr. Viantasked the Minister of Health what are the tests for potency made on the poliomyelitis vaccines.
§ Mr. Walker-SmithThe potency of each batch is tested on twelve Rhesus monkeys whose serum does not contain any inhibitors to poliomyelitis virus. Each monkey receives a course of vaccine and the level of antibodies to each type which develops is determined.