CDC

The link to the CDC above contains everything you need to know about mercury in some vaccines, and refutes just about everything Local Yokel has posted regarding vaccine safety.

mg, a percentage of our children have always been sexually active by 12, 13, 14. Pregnancies, when that was the result (and it isn't always, obviously) were hidden, frequently the grandmother claimed the child as her own. Sexual exploration is a natural consequence of our physical nature, the age at which our bodies mature, and until recently, speaking historically, 13 or 14 was not an unusual age to marry. We artificially prevent reproduction, not just with contraception, but with culture. Cultural pressure is bound to fail a percentage of the time, and teens having sex is one result.

The best we can do is try to persuade children to consider consequences, and failing that, teach them how to protect themselves. A vaccine that helps them live in spite of early misadventures is a good thing.

But the vaccine should be free or cheap.