When my son began his routine vaccination series at age 2 months, I did not know there were any risks associated with immunizations. But the clinic's literature contained a contradiction: the chances of a serious adverse reaction to the DPT vaccine were 1 in 1750, while his chances of dying from pertussis each year were 1 in several million. When I pointed this out to the physician, he angrily disagreed, and stormed out of the room mumbling, "I guess I should read that sometime..."