Dr Mehmet Oz, administrator of the Centres for Medicare and Medicaid Services, on Sunday, 23 August flatly denied that the combined measles, mumps and rubella (MMR) vaccine was dangerous, stepping in to clarify comments made by President Donald Trump that had raised alarm among public health experts. The statement came as fresh federal data showed US childhood vaccination rates had slipped below the threshold required for herd immunity.

What Oz Said

Appearing on CBS News' Face the Nation, Oz was pressed repeatedly on Trump's characterisation of the MMR vaccine before stating plainly: 'No, the MMR vaccine is not a lethal vaccine.' He added that the administration's position was that Americans should 'get vaccinated as their doctors recommend, as long as they have a choice in the matter.'

Oz also argued that the broader principle at stake was parental autonomy — whether parents had the right to question vaccination recommendations and seek religious or other exemptions from state requirements. He confirmed that the federal government would continue funding vaccines for children from low-income families regardless of how they were administered: 'We're going to pay for the vaccines no matter what,' he said.

What Trump Actually Said

In a recorded clip played during the programme, President Trump suggested the three vaccines in the MMR combination should be given separately. 'In three separate vaccinations, given at separate times, together there could be a possibility they're quite lethal,' Trump said. 'And separately, it looks like they are not at all lethal, but just very effective. So the MMR, we want to have separate, separate visits, separate times,' he added.

CBS presenter Margaret Brennan noted that Trump had made this suggestion twice and pointed out a critical logistical barrier: the MMR vaccine is not currently available in the United States as three separate injections. Its sole manufacturer, Merck, reportedly could not offer disaggregated vaccines for at least another 10 years, according to Brennan.

The Vaccination Rate Concern

The exchange unfolded against a backdrop of declining immunisation coverage. New figures from the US Centres for Disease Control and Prevention (CDC) showed that only 92% of the country's kindergarten pupils received measles vaccination during the last school year — below the 95% level considered necessary to achieve herd immunity and prevent community spread.

Oz cited Japan as an example of a country that administers measles vaccines separately. Brennan countered that Japan had encountered problems following that separation and that the change had driven up costs — a point Oz did not directly dispute.

Why This Matters

The MMR vaccine protects against three contagious viral diseases. Measles, in particular, can cause pneumonia, inflammation of the brain, and death, especially in young children and those with weakened immune systems. Public health authorities have long warned that vaccination rates falling below the herd-immunity threshold leave vulnerable populations — including infants too young to be vaccinated — exposed to outbreaks.

With the administration sending mixed signals on vaccine safety, health experts warn that further erosion of public confidence could push coverage rates even lower in the coming school year.