The health secretary's inaccurate claim stems from a misunderstanding of how the measles, mumps and rubella vaccine is made.

WASHINGTON — Dr. Mehmet Oz clarified Sunday that the measles, mumps, and rubella (MMR) vaccine is not lethal, after President Trump raised concerns when signing an executive order earlier this month pushing for the three-in-one inoculation to be separated.

The head of the Centers for Medicare and Medicaid Services was asked three times to clarify claims made by President Donald Trump earlier this month.

In an executive order signed earlier this month, President Donald J. Trump said measles, mumps and rubella vaccines should be split up and administered as three separate vaccines. But experts have said there is no evidence to support splitting up the vaccines,

In the wake of two measles-associated deaths in Pennsylvania, including an infant, Health Secretary Robert F. Kennedy Jr. took to social media to suggest the deaths may have been fabricated and to spread debunked claims about the measles, mumps, and rubella (MMR) vaccine.

The Kansas Health Department has reported a nearly 4% drop in Kindergarten vaccination records for the MMR vaccine from 2019 to 2025.

New York health officials are urging people to check their measles vaccine status as confirmed cases increase statewide.