If you want to bring the "fire" out of David Christopher at a seminar just mention that your thinking about vaccinating your kids......... He and most all the good books I like are all against vaccinations 100% in all situations 100% of the time.
My kids are doing pretty good based on what we knew at the time each was conceived. I do truely believe the health of mom before conception plays the major roll in the child's life for the rest of its life.