In her U.S. News & World Report column, Bernadine Healy, MD, wrote about the debate over vaccinating children, saying, “Less than a year ago, the National Institutes of Health put out a call for expanded research on vaccine safety that contains many of the very things that parents are asking for: examination of the way the immune system handles different vaccines, the impact of nonvaccine components (like mercury and aluminum), and better understanding of susceptibility to vaccine side effects.” The government “laid out the need for markers that might predict vulnerable groups and proposed research on the comparative effect of different vaccine schedules and combinations of vaccines.” This work “is long overdue; shockingly, so is a study comparing groups of vaccinated and unvaccinated children.”