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A final solution is expected from an AIDS vaccine. A number of theoretical approaches are being tested. On the one hand attempts are being made to find a vaccine that prevents infection itself, while on the other hand a vaccine that is administered to persons who are already infected and that influences the course of the infection in the good sense would be very useful. As AIDS vaccines are at present still in an experimental stage, prevention and control of the infection should be concentrated on three levels: sexual transmission, prevention of transmission via contaminated blood or needles, and mother-to-child transmission.
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