The Benefits of a Kill Vaccine

In the 50s there was two vaccines developed, one by John Solk and one by Albert Sabin. The kill vaccine is very effective to prevent disease, but it doesn't prevent the virus to circulate. It continue being transmitted from people to people in a silent form without causing disease. So your challenge then was to try to come up with something with all the virtues and benefits of that Sabin live vaccine. That does endow sufficient protection to stop this virus circulating,. But doesn't have the problem of it reverting back to being a transmissible, fully virulent virus capable of causing polio like symptoms.