On April 30, 2025, Department of Health and Human Services (HHS) Secretary Robert F. Kennedy Jr. incorrectly stated that the vaccine against measles, mumps, and rubella (the MMR vaccine) contains “a lot of aborted fetus debris.” In fact, the vaccine “is produced using human cell lines that originated from two legal abortions in the 1960s but these cells are not present in the final vaccine.” Secretary Kennedy’s misleading comments were made in the midst of a serious outbreak of measles in Texas and beyond.