Archive · 11 Aug 2026
Trump orders split of MMR vaccine as measles outbreak worsens
The leader of the United States signed a special paper about vaccines, which are medicines that help keep kids from getting very sick.
Right now, children usually get one shot that protects them from three diseases at once: measles, mumps, and rubella.
The special paper asks for a different plan, where kids might get three separate shots instead of one.
It also suggests kids could get their vaccines on different days rather than all at once.
Many doctors are worried about this idea.
They say the one-shot vaccine has been used safely for many years.
They also worry that splitting the shots could make it harder for families to finish all their visits.
The United States is seeing a very big measles outbreak right now, with more than 2,300 cases this year.
Doctors want children to keep getting the protection that has been proven to work.
President Donald Trump signed an executive order calling for the combined measles, mumps and rubella (MMR) vaccine to be split into three separate shots.
The order also calls for childhood vaccinations to be spread across separate medical visits instead of administering several vaccines during a single appointment.
The US is facing its worst measles outbreak in decades, with more than 2,300 cases reported so far this year — the highest annual total since 1991.
Medical groups including the American Academy of Pediatrics oppose the changes, citing decades of evidence supporting the combined MMR shot's safety and effectiveness.
Standalone measles, mumps and rubella vaccines are not currently available in the US and would require new regulatory approval and manufacturing.
- Who
- US President Donald Trump signed the order; the Department of Health and Human Services, headed by Robert F. Kennedy Jr., is tasked with carrying it out.
- What
- An executive order seeking to overhaul childhood vaccination policy, including separating the MMR vaccine into individual shots and staggering vaccine visits.
- When
- Monday, August 10
- Where
- United States; the order was signed at the White House.
- Why
- As the US faces its worst measles outbreak in decades, with more than 2,300 cases this year and declining vaccination coverage.
Trump administration
Medical community
Splitting the MMR vaccine
Trump administration
Families should have the option of separate measles, mumps and rubella shots instead of being limited to the combined vaccine.
Medical community
There is no scientific basis for splitting the MMR vaccine; decades of evidence support the combined shot's safety and effectiveness.
Staggered vaccination visits
Trump administration
Children should receive vaccines across multiple appointments rather than getting several shots during one visit.
Medical community
Spreading vaccinations across appointments creates unnecessary barriers and could delay timely protection for children.
Federal versus state vaccine rules
Trump administration
States should review their school vaccination requirements in line with the revised federal recommendations.
Medical community
Vaccination policy should not be dictated by politics; states retain authority over school enrollment mandates.
- Executive order
- Signed by President Trump on Monday, Aug 10
- Measles cases (this year)
- More than 2,300 — highest annual total since 1991
- Proposed change
- Separate MMR vaccine into individual measles, mumps and rubella shots
- HHS Secretary
- Robert F. Kennedy Jr.
- Standalone vaccine availability
- Not currently available in the US; requires new regulatory approval and manufacturing
- Key critics
- American Academy of Pediatrics, Senator Bill Cassidy, NYC Health Commissioner Alister Martin
- Measles elimination
- Achieved in the US in 2000; declining vaccination coverage could threaten that status
- Development timeline estimate
- AAP says approved standalone vaccines could take years or more than a decade
