In 1974 he was instrumental in initiating the global program of immunization, which has vaccinated 80 percent of the world's children against six major diseases and is striving to eradicate poliomyelitis.
He was instrumental in initiating the global program of immunization against six major diseases. This was in 1974. He is striving to eradicate poliomyelitis. This is in 1974. Immunization has vaccinated 80 percent of the world's children.