I'm old enough to remember the polio vaccine being absolutely rushed and causing serious complications and deaths. Fdr himself had polio and one of  oschners grandkids died from the vaccine and the other contracted polio. I also remember he mortality rate dropping by 82% pre vaccine year which to anyone with common sense would show it had been naturally dying off as it did in the 20's. Plenty of good books on the subject. Dr Mary's monkeys and the virus and the vaccine and the march of dimes are just a few. Plenty of good history that conveniently gets left out by vaccine promoters and supporters