I remember as well... even before the Polio vaccine. Parents were terrified that their kids would get it. I went to school with kids who wore braces and walked with crutches... and they were the lucky ones that didnt die. The polio vaccine was a savior for millions around the world. You don remember the others because the likely didnt exist when you were a kid, or you got a shot you dont even remember. Measles, mumps, and pertussis (hooping cough) Vaccine did not come around till the 70s. Chicken pox was much leter. But dont brush off these childhood illnesses. They can be fatal or lead to life lone problems.