[frumper]

Why stop at 20 years? What makes that a magic number. Your kids, if vaccinated, will be concerned about heart, brain or reproductive issues in 30 years. It's funny you mention measles as there are many people that still don't trust the track record of the measles vaccine.

[blitz_skull]

Well I said 20 because I DO trust the measles record. My kids aren't going to be worried about it if it's been around for 20 years. ¯\_(ツ)_/¯