The Government's Vaccine Advice Is Giving Me Whiplash...

President Trump signed an executive order yesterday calling for major changes to the childhood vaccine schedule.

The order narrows the vaccines recommended for all children to those protecting against 11 diseases, moves several others into high-risk or shared decision-making categories, says the combined MMR vaccine should eventually be separated into three individual vaccines, and calls for childhood vaccines to be given at separate medical visits “to the maximum extent feasible.”

If you saw that headline and thought, Wait...WHAT?, I get it.

But before you start wondering whether your child’s appointment tomorrow suddenly looks different, there’s an important distinction here.

President Trump signed an executive order. He did not magically rewrite what happens in every pediatrician’s office overnight. Federal agencies still have work to do, and parts of the order could run directly into the same legal problems this administration (HHS) faced when it tried to make similar changes earlier this year. (C’mon courts-do your thing!) Splitting MMR into three separate vaccines also can’t happen right now because those individual vaccines aren’t currently available in the United States.

So yes, I care about this. But to be clear, just because our Commander in Chief got excited with his Executive Order pen doesn’t mean things are changing overnight.

But, can we talk about the whiplash for a second?

Because this part is hard to ignore.

On August 2, CNN’s Dana Bash asked Health Secretary Robert F. Kennedy Jr. to look directly at families and tell them what they should do about measles given we are seeing the highest number of cases we have seen in a year since measles was declared eliminated in this country… which he did: 

That was nine days ago.

Yesterday, the president signed an order saying the combined MMR vaccine should eventually be broken into three separate vaccines and given at separate visits. The order goes even further and says childhood immunizations generally should be administered at separate medical visits whenever feasible.

So I have a very reasonable question: What changed in nine days?

We are currently seeing the highest number of measles cases in the United States in 35 years and come this fall we will likely lose our measles elimination status. Kennedy was right nine days ago, yes, I will always call it out when this administration says or does something I agree with, when he told families that vaccination is how we stop measles.

There also isn’t published scientific evidence showing a benefit to separating the combined MMR vaccine into three individual vaccines. The CDC’s own vaccine safety page still says there is no published scientific evidence showing any benefit to separating the MMR vaccine into three individual shots. That said, I'd be wary of leaning too hard on the CDC's website these days. I still trust plenty of what's on there, but some pages seem to have been hijacked by misinformation, so stay with me as I separate fact from fiction.

If new evidence emerged that showed separating MMR was safer or more effective, I would want to see it and read it. I’d change my recommendations if the evidence supported doing that and our clinical experience as pediatricians warranted a revisit to this need. 

That’s how medicine is supposed to work, but I haven’t seen that evidence presented here.

So what did the order say?

Here’s the simplest version.

Vaccines recommended for all children: vaccines protecting against measles, mumps, rubella, diphtheria, tetanus, pertussis, polio, Hib, pneumococcal disease, HPV, and varicella.

Vaccines moved into high-risk and/or shared decision-making categories: hepatitis A, hepatitis B, RSV monoclonal antibody protection for infants, meningococcal B, meningococcal ACWY, dengue, rotavirus, influenza, COVID-19.

MMR: the administration says measles, mumps, and rubella should eventually be given as three individual vaccines once those products become available in the United States. Newsflash–they’re not given anywhere so where will they magically get these from?

Vaccine timing: the order says childhood vaccines should be given at separate medical visits “to the maximum extent feasible.”

Aluminum adjuvants: HHS is directed to develop a plan for additional alternatives to aluminum-containing adjuvants and to conduct comparative safety and efficacy studies.

The claims behind the changes

Every one of these policy changes was backed by a claim at the signing (and remember a claim isn’t always truth). Here's what was said, and what the evidence actually shows.

Autism: Trump opened the entire announcement by tying it to autism, saying the new recommendations have "to do with many subjects, but including autism in particular," and claimed splitting the MMR shot would have "a huge impact on autism."Decades of research, involving millions of children, have found no link between vaccines and autism. This claim is not new evidence, it is the same disproven theory getting a new microphone. This matters because rhetoric like this doesn't need to be true to do damage. It just needs to sound official. And when it comes from the highest office in the country, it gives an old, disproven idea a whole new audience of parents who trusted that someone would have checked the facts first

MMR safety: Trump called the combined MMR shot "quite lethal" and said "nothing bad can happen" from splitting it into three doses. The combined MMR vaccine has been used safely for more than 50 years, and there is no published evidence that splitting it improves safety or reduces any risk. If something were actually "quite lethal," like, I don't know, machine guns, I promise you every pediatrician in this country would be sounding the alarm.

Vaccine volume: Trump described childhood vaccines as looking like "the size of a bottle of soda" being "poured into" a child's body, and said kids should have five separate visits instead of getting shots together. This is not an accurate description of vaccine volume, and there is no evidence that spacing out shots protects a child's immune system. It does mean more appointments, more time off work, more injections, more of the additives they seem to fear given more injections, and more chances for a family to fall behind schedule.

Aluminum adjuvants: The order directs HHS to develop alternatives to aluminum containing adjuvants and to study their safety and effectiveness compared to what is used now. Aluminum adjuvants have been used in vaccines for close to 100 years and are considered safe and well studied. Studying alternatives isn't inherently a problem, but it is being introduced here alongside a claim of risk that the current evidence doesn't support. Looking for more? Here is my YouTube video on vaccine ingredients. 

What comes next: HHS has 90 days to present plans addressing single-antigen vaccines, vaccine timing and sequencing, alternative adjuvants, safety monitoring, and additional research.

The White House describes this as reducing universal childhood immunization recommendations from protection against 18 diseases to 11. The AAP continues to recommend its evidence-based 2026 childhood immunization schedule, which differs substantially from the federal changes.

And this is where the risk-benefit conversation is important.

Fewer routine vaccines doesn’t mean those diseases became less concerning

When I look at vaccine recommendations, I’m always thinking about benefit versus risk.

What is the risk from the vaccine?
What is the risk from the disease?
How likely is this child to encounter it, and what happens if they do?

Those are reasonable questions. They’re exactly the questions medicine should be asking.

But taking a vaccine out of the routine category doesn’t remove the disease risk.

Take hepatitis B. The AAP continues to recommend hepatitis B vaccination for newborns within the first 24 hours of life. When hepatitis B is acquired during infancy, about 90% of infected newborns develop chronic infection, which can eventually lead to cirrhosis or liver cancer.

That is why the birth dose exists. 

In my own practice, if a birthing parent has confirmed negative hepatitis B testing and no ongoing risk factors, I understand when a family chooses to delay the birth dose and start the series with routine infant vaccines. But I still recommend hepatitis B vaccination. It is safe, it is included in common combination vaccines, and it is protection I would not want a child to go without.

RSV is another big one. RSV is a leading cause of hospitalization in infants. Since the introduction of the RSV antibody nirsevimab, we have seen significant drops in RSV hospitalizations among eligible infants. As a practicing pediatrician for over 11 years (14 including residency), I cannot express enough how much of a game-changer this has been. Seeing this antibody introduced and seeing its positive impact has been watching modern medicine work in real-time. Real-world data has also found it to be about 80% effective at preventing RSV-related ICU admission and 83% effective at preventing RSV-related respiratory failure.

That is why protecting babies before their first RSV season matters.

Then there is meningococcal disease. It is rare, but it can become life-threatening very quickly, causing meningitis, bloodstream infection, permanent disability, or death. Since routine MenACWY vaccination began, disease caused by serogroups C, W, and Y has dropped by more than 90% among adolescents.

That is why we vaccinate before the highest-risk years.

And this is where I get on my little soapbox. Shared decision-making is already part of good medicine. So when executive orders or non-medical professionals throw this term out, I do groan a bit.l We should be talking with families about benefits, risks, and what makes sense for their child. My concern is what happens to access and uptake when something is no longer routinely recommended.

I want these vaccines and preventive antibodies easy to get and available without cost barriers. Parents should not have to make extra appointments, call multiple pharmacies, or run around town trying to find a preventive tool that can reduce their child's risk of serious illness. The recommendation on paper matters because it can shape what happens in the real world.

These diseases haven’t read the executive order. They don’t become less contagious or less capable of causing complications because the federal government moves a vaccine from one recommendation bucket to another.

When we recommend fewer vaccines routinely, we’re making a decision about how much preventable disease risk we’re willing to leave on the table. That deserves a much more serious scientific discussion than I saw today.

And then there’s the “one vaccine per visit” idea

There is an enormous practical difference between saying, “Families should have options,” and creating a system that makes children return over and over again for vaccines they can safely receive during the same appointment.

Giving recommended vaccines together has been studied. A child’s immune system is capable of responding to multiple vaccines at once, and there is no evidence that routinely recommended vaccines “overload” it.

Spacing everything out also has a cost. Families would need to come back for additional appointments, which can mean more time away from work or school and more barriers to getting every dose on time. And because life happens, every extra visit creates another chance for a vaccine to be delayed or missed altogether. 

There is also a reason vaccines are given at specific ages and intervals. Vaccine schedules are studied to balance safety with giving children effective protection at the ages they need it most. Spacing doses farther apart can leave a child susceptible to disease for longer without evidence that the alternative schedule is safer or provides better immunity.

If high-quality, peer-reviewed evidence shows that a different schedule is safer or produces better protection, recommendations should absolutely change. But changing the spacing across the board should be driven by that evidence, not simply by the assumption that more time between vaccines must be better.

There’s also the healthcare system itself. If recommendations shift toward giving fewer vaccines at the same visit or spacing them farther apart, completing the same vaccines could require more appointments. Pediatric offices already have limited availability, and many communities are dealing with shortages in pediatric care. If one well visit turns into several vaccine-only visits, those appointments have to come from somewhere. Pediatric offices aren’t exactly sitting around looking for more things to squeeze into an already packed day and not all families have the time or means to make more visits to a clinician’s office than they already are.

We know that delaying vaccines or using alternative schedules can leave children underimmunized for longer and make it harder to stay caught up with the recommended schedule.

And in the case of MMR, we would first need three individual vaccines that don't currently exist on the U.S. market, which could take years.

And here's another important piece: no country's government routinely recommends replacing MMR with three separate measles, mumps, and rubella vaccines. A few countries use single-antigen vaccines in specific circumstances, but not as a routine replacement for MMR. France, for example, has used a measles-only vaccine in certain situations for babies too young for the routine schedule, followed by MMR later.

Other countries have considered how best to deliver these vaccines and have continued to use combination vaccines. In fact, some countries have moved toward combining even more vaccines rather than separating them.

We're talking about separating a vaccine that has decades of safety and effectiveness data into three products that aren't currently available in the United States, without evidence that doing so is safer or more effective.

And maybe I'm skeptical, but I also have a hard time imagining this administration enthusiastically introducing three new individual vaccine products to make this happen.

Meanwhile, we eliminated endemic measles transmission in the United States in 2000 because vaccination worked extraordinarily well. We're now seeing the highest number of measles cases in the U.S. since the early 1990s, with many of the largest outbreaks occurring in communities with low vaccination coverage. And at this particular moment, we're introducing changes that could make vaccination more complicated while raising new questions about a vaccine that has been routinely used for decades.

So yes, the whole thing starts to feel like smoke and mirrors and political theater. So much attention, so much hoopla, so much doubling down...for what? What are we actually making safer or better for children here? Because I still haven't seen the evidence that the problem they're claiming to fix existed in the first place.

Because I also wonder who these changes are really serving. There is a small but very vocal group that is firmly opposed to vaccines, and I imagine many of them see this as a win. But then there are millions of parents who vaccinate their children, or who have reasonable questions and look to their pediatrician and public health recommendations for guidance.

Those are the families I worry about–the vaccine-curious families.

When recommendations suddenly change without clear new evidence showing that the previous schedule was unsafe or inferior, it creates a very reasonable question: Wait, did we learn something new? Was the old schedule not safe?

And that confusion has consequences. A parent who was already unsure may become more hesitant, not because the science changed, but because the recommendation did.

Public health recommendations don't just determine what we offer. They also help families understand what to trust. And this kind of whiplash is exhausting, especially when recommendations change around vaccines that have been routinely used and extensively studied without new evidence presented to explain the shift.

I’m frustrated, and I know a lot of you are too

The political landscape around vaccines has changed dramatically, but the science supporting the routine childhood vaccines did not suddenly change with it.

The AAP continues to recommend its 2026 immunization schedule based on vaccine safety data, the diseases circulating in the United States, their potential complications, and the evidence that vaccines prevent them.

Even Republican Senator Bill Cassidy, who is also a physician, called today’s executive order “wrong” and reiterated that vaccines are overwhelmingly safe, effective, and do not cause autism. I have my own frustrations with Dr. Cassidy and the role he played in confirming Kennedy, but on this point, I agree with him.

Because once again, pediatricians are going to spend the next several weeks answering understandable questions from families who are trying to figure out whether something new was discovered that they should be scared of.

Nothing presented today showed that. And this is where the public health messaging becomes so frustrating.

Nine days after the country’s top health official finally gave families an unequivocal message to vaccinate against measles, the president gave those same families a fresh reason to wonder whether there is something wrong with the combined vaccine. This is the whiplash that is frankly exhausting. 

I don’t need to know the political calculus behind that decision to know what happens next.

More confusion…hesitation…. parents sitting across from pediatricians asking, “But if it was safe, why is the government suddenly telling us to separate it?”

Those are reasonable questions created by inconsistent messaging.

Didn’t they already try this?

Yep. And this is the part of the story I really don’t want lost.

In January, the CDC attempted a similar overhaul of the childhood immunization schedule, reducing the number of routinely recommended vaccinations and moving several vaccines into other recommendation categories.

Medical organizations, including the AAP, challenged those changes in court.

On March 16, a federal judge blocked major portions of the overhaul. The judge was concerned enough about both the way ACIP was reworked and the way the childhood vaccine schedule was changed to step in and pause those changes while the case continues.

The administration appealed that ruling.

And today’s executive order acknowledges that its previous vaccine directives have been delayed because of ongoing litigation over both the federal vaccine schedule and the makeup of the CDC’s vaccine advisory committee.

So this isn't coming out of nowhere. It's another attempt to move a very similar policy forward, this time with an executive order behind it.

And I keep coming back to the same question: Why are we doubling down so hard on this?

Of all the problems facing children and families in this country, why is so much political attention being spent dismantling a vaccine schedule that has decades of safety and effectiveness data behind it, without presenting compelling new evidence that these changes will make children healthier?

There are enormous issues affecting children that deserve this level of urgency and attention: access to healthcare, food insecurity, gun violence, child abuse and exploitation, maternal mortality, mental health, and families struggling to afford basic needs.

So yes, I want to know what problem we're trying to solve. And I also want to know what problems we're choosing not to talk about while we keep coming back to this one.

Okay, but what does an executive order really do?

This is probably the most useful part if you’re trying to understand what happens from here.

An executive order does not go through Congress for a vote before the president signs it.

Presidents can use executive orders to direct federal agencies, but they can’t create new powers out of thin air. The president still has to be acting within authority granted by the Constitution or Congress, and courts can step in if an order or the actions taken to carry it out go beyond that authority or conflict with existing law.

Today’s order is real. It establishes the administration’s policy and gives federal agencies marching orders.

The downstream changes are a different story.

HHS still has work to do. Some of the order specifically gives the department 90 days to develop plans. Federal agencies still have to operate within statutes and required procedures. State vaccine requirements don’t automatically disappear because the president signed this.

And courts can absolutely become involved again. We know that because they already did.

So does this change your child’s next appointment?

For most families, there is unlikely to be an immediate change.

Separate measles, mumps, and rubella vaccines aren’t currently available in the United States, so the MMR vaccine your child would receive today is still the combined vaccine. The AAP also continues to recommend its evidence-based childhood immunization schedule.

So if your child is due for vaccines, I would not delay them because you saw this headline. Follow the evidence-based schedule you discuss with your pediatrician.

You do not need to spend tonight becoming an amateur vaccine-policy attorney.

My vaccine guide is always free, and I’ll continue updating it based on the scientific evidence and the clinical recommendations I use in practice. If my guidance changes on ANYTHING–this newsletter community is always the first to know. 

Final thoughts

I keep coming back to the issue of consistency.

Trust in public health does not require recommendations to stay frozen forever. Medicine changes all the time, and it should. New evidence comes in, we learn something we didn’t know, and guidance evolves.

When that happens, we should be able to show people the evidence that changed our thinking.

That’s what is missing for me here.

Nine days ago, families were told to get the MMR vaccine as the U.S. was seeing its highest number of measles cases since the early 1990s. Today, they're being told that same combined vaccine should eventually be pulled apart and that childhood vaccines should, whenever possible, happen at separate visits.

That is the whiplash.

Recommendations can change. They should change when the evidence changes. But when the recommendation changes and the evidence hasn't, families are left wondering what they're supposed to trust.

So I keep coming back to the same question I asked at the beginning:

What has changed?

The evidence hasn't. My experience as a pediatrician, and the experience of my colleagues, hasn't. And until the evidence gives us a reason to change course, neither will my recommendation.

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