Exemptions from immunization requirements among kindergartners hit their highest level on record this past school year.

Dr. Noel Brewer, a former ACIP member removed by Kennedy and a professor in the department of health behavior at the University of North Carolina Gillings School of Global Public Health, told ABC News that since the upheaval of the ACIP, vaccination has changed in the U.S. in a "fundamental" way and that the committee has "lost credibility."

Democratic lawmakers on the U.S. Senate's Health, Education, Labor, and Pensions ((HELP) Committee on Tuesday launched an investigation into Health and Human Services Secretary Robert F. Kennedy Jr.’s decision to dismantle a key CDC vaccine advisory panel,