Lessee, now.  Are parents especially fearful when summer rolls around again, and kids start jumping into swimming pools all over the US and Canada?  No.  Not any more.  Not about polio, anyway.

Seen any iron lungs lately, outside of museums?  Or, has there been a technological equivalent developed in the last couple of decades?  No.   No longer needed or wanted.  

Kids on braces, hobbling into their elementary school classrooms?  Hardly ever.  And never because of polio.  

That's now the "good history" skyline4me.  Yeah, I remember the vaccine being rushed and kids dying because of it, too.  That's also "good history" as you say.  Because it taught the medical sector NOT to rush.  Very, very good.