There are two vaccines that come to mind that cause parents to pause: 1.
The Chicken Pox vaccine, because it's not seen as a deadly disease, and most
adults have had it as kids and the only ill effect was a week off from school.
Also the idea is that once you've had chicken pox, you never get it again, but
the vaccine hasn't been able to make that claim. 2. The Human
Papaloma virus: which protects kids from a sexually transmitted disease... Many
parents feel that their kids won't be at risk because their kids aren't going to
have sex at an early age, and they envision their children being sexually
responsible adults. The problem with forcing parents to get vaccines
is the internet-scare-based, non-scientific rumors that you will cause your kids
to have autism if you give them vaccines. Shows like the X-files didn't help
matters by promoting the idea that there's a government conspiracy to harm you
if you get one. Still many vaccines only work if a large enough population is
immunized--the net-effect keeps disease from massive outbreaks. Working together, Getting vaccines, it's part of a civilized society.