The constitutional right to be bone stupid.
Latest vaccine news I've read is about the TB vaccine - the BCG, which was given to all babies across Europe for many years. This vaccine has now been discovered to have a significant effect on the probability of getting Alzheimer's, cutting the chances of coming down with A and other dementias by 20%.
Sadly, a lot of countries have now stopped giving babies the BCG, as TB was reckoned to no longer be a huge danger.