put another way, the boys and girls received at least one injection of vaccine at four times as much protection as those without it. we can all be proud of the salk vaccine. we can all share in this victory. it will lead to many more in the years ahead. for maximum protection for paralytic polio, three inoculations. the second given no more than three weeks after the first. the third, no more than seven months later. everyone in your community should be vaccinated now. vaccination will saves lives from death or paralysis this year. help your child grow up strong and straight. free from crippling polio. youngsters like david eisenhower, like polio pioneers randy kerr, are part of a bright new future which will see the unconditional surrender of infantile paralysis. next on american history tv national portrait gallery senior historian david ward gives a virtual tour. he focuses on presidential portrait including andrew jackson, abraham lincoln, and harry truman. the smit