Cassidy Condemns Trump Order Splitting MMR Into 3 Shots as Costs and Access Risks Rise

Q: Since single-disease MMR shots lack FDA approval, what is the realistic timeline for these alternatives to reach clinics?

Not anytime soon. Since no monovalent measles, mumps, or rubella vaccines are currently licensed in the United States, realistic availability in clinics would likely be measured in years, not months, and some experts say more than a decade. The main reason is regulatory and manufacturing reality. Separate shots would need to be developed or reintroduced by a manufacturer, supported by clinical testing, produced at scale, and then submitted to the FDA through a biologics license application. That process also requires manufacturing validation, inspections, labeling review, and distribution planning before any doses could reach pediatric offices. There is also no sign of an immediate commercial pathway. Merck stopped supplying single-disease measles, mumps, and rubella vaccines in the U.S. in 2008, saying the combined MMR vaccine was preferred because it reduced injections and delays. Public reporting cited experts saying they are unaware of any company currently planning monovalent versions, and manufacturers have little incentive to invest in a product for which there is no published evidence of added safety or effectiveness. So even if the administration pushes for separate shots, clinics are unlikely to see them in the near term. The existing FDA-approved MMR vaccine would remain the practical option unless a company launches a full development and approval program, which experts say would take many years.

3 articles · Updated · The Washington Post · Aug 17

Bill Cassidy said Trump’s order to split the MMR vaccine into three separate shots is a “crazy, stupid thing” that would raise patient costs without any medical benefit.
Three separate shots would mean more doctor visits for families, Cassidy said, making vaccines less accessible and likely lowering vaccination rates.
Higher insurer spending on those extra visits would also push up premiums, he added, as healthcare costs remain a voter concern.
Cassidy, a physician who lost his May primary, has become more willing to break with the administration even after voting last year to confirm HHS Secretary Robert F. Kennedy Jr.