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Dr. M. Just, Basel, Switzerland: I should like to present some data collected by A. Buergin-Wolff, G. Ritzel, U. Krech, O. Geel, M. Jung, and myself regarding clinical trials in children. Three possibilities for preventing the postrubella syndrome by immunization against rubella are being discussed at the present time in Switzerland.
1. It would seem that immunization of women before marriage or shortly before pregnancy is not a very successful method, as it is very difficult to convince adults of the value of prophylactic measures.
2. Immunization of preschool girls and boys should lead to the eradication of rubella.
As long as we do not know the exact duration of immunity after rubella vaccination it will be impossible to immunize the majority of preschool children against rubella in our country. To illustrate the difficulties we are encountering. I might mention that there is still strong resistance to even measles-vaccination in