It's a public health issue... any place [eg. a school] where living organisms are crammed unnaturally close together are breeding grounds for disease.
We should be most concerned with forcing big pharmaceutical companies to be more transparent about testing the vaccines for side-effects, and hold them more accountable for their failures to do so, such as the scandal with trace mercury in vaccines now bieng linked to autism. It's really tragic when we, as a society that is too interested in watching American Idol to pay attention to the hoodwinks of Big Pharma, force kids to suffer like that, when they have no choice whatsoever in the matter.