The Second Circuit Upholds New York’s School Vaccine Mandate — But the Supreme Court May Not Be Done With This Fight

How the Second Circuit’s vaccine mandate ruling could reshape school safety, religious exemptions, and the next Supreme Court fight.

The Second Circuit has once again upheld New York’s school vaccine mandate, setting up what could become one of the most important vaccine-law cases to reach the United States Supreme Court in years.

The case is Miller v. McDonald, brought by several Amish parents and Amish community schools challenging New York’s school immunization law. New York’s law requires children attending public, private, and parochial schools to receive required childhood immunizations unless they qualify for a medical exemption. New York eliminated its religious exemption in 2019 following a major measles outbreak.

The plaintiffs argued that New York’s vaccine requirement violated their religious rights and parental rights, particularly because it allowed medical exemptions but not religious exemptions. The Second Circuit rejected that argument. In its June 30, 2026 decision, the court reaffirmed that New York’s law is a neutral, generally applicable public-health law and that it does not target religion.

That does not necessarily mean the case is over.

Why This Case May Go Back to the Supreme Court

This case has already been to the Supreme Court once. After the Second Circuit originally upheld New York’s law in March 2025, the plaintiffs sought Supreme Court review. The Supreme Court granted the petition, vacated the Second Circuit’s decision, and sent the case back for reconsideration in light of Mahmoud v. Taylor, a recent religious-liberty and parental-rights decision involving public schools.

That procedural move is called a “GVR” — grant, vacate, and remand. It does not mean the Supreme Court decided the plaintiffs were right. But it does mean the Court believed the Second Circuit should take another look after Mahmoud.

The Second Circuit has now done exactly that — and reached the same result. The court concluded that Mahmoud does not change the constitutional analysis for New York’s school vaccine law. In other words, the Second Circuit drew a line between school curriculum or compelled exposure to certain instruction, which was at issue in Mahmoud, and longstanding public-health vaccine requirements for school attendance.

That makes the next step obvious: the plaintiffs are likely to ask the Supreme Court to review the case again. Whether the Supreme Court accepts the case is another question. The Court may decline review and allow the Second Circuit’s decision to stand. But given that the Court already showed interest by sending the case back once, it would not be surprising if the plaintiffs try again.

The Legal Issue Beneath the Headlines

At the heart of the case is a constitutional question: when a state allows medical exemptions to school vaccine requirements, must it also allow religious exemptions?

New York’s position is that medical exemptions are fundamentally different. A medical exemption is based on a physician’s determination that vaccination may be unsafe for a particular child because of that child’s medical condition. A religious exemption, by contrast, is not based on individualized medical risk. It is based on belief.

That distinction matters. Vaccine mandates work because they create broad community protection. When enough children are vaccinated, schools become safer places for everyone — including infants, immunocompromised children, children undergoing cancer treatment, and children who truly cannot be vaccinated for medical reasons.

The Second Circuit accepted New York’s public-health rationale. It treated the law as a neutral public-health rule, not as a law designed to burden religion.

The Political and Social Implications

This case arrives at a politically charged moment. Vaccine mandates, religious liberty, parental rights, school authority, and public health have all become flashpoints in American politics.

The case also comes at a time when Robert F. Kennedy Jr., now a major national political figure and vaccine skeptic, has helped move vaccine skepticism from the fringe into mainstream political debate. RFK Jr. does not appear to be a party or counsel in Miller v. McDonald. But the broader movement challenging school vaccine mandates has included groups and legal arguments associated with vaccine skepticism, and reporting has noted prior New York vaccine challenges backed by RFK Jr. or vaccine-skeptical organizations.

That political context matters because school vaccine mandates are no longer being debated only as public-health rules. They are increasingly framed as parental-rights issues, religious-liberty issues, and government-power issues. Those are serious constitutional themes. But they should not obscure the equally serious public-health stakes.

Schools are uniquely vulnerable environments. Children learn together, eat together, play together, ride buses together, and often spend hours indoors in close contact. When vaccination rates drop, preventable diseases can spread quickly. Measles is the clearest example because it is extraordinarily contagious and can spread through a school community before families even realize there has been an exposure.

The point of school vaccine mandates is not punishment. It is prevention.

Why School Vaccine Mandates Matter

School vaccine mandates protect children. They also protect teachers, school staff, pregnant family members, newborn siblings, grandparents, and medically vulnerable classmates.

They help schools function. When vaccine-preventable outbreaks occur, schools may be forced to exclude unvaccinated children, notify families, coordinate with public-health departments, cancel activities, or temporarily disrupt normal operations. Those disruptions affect everyone — not only the families who object to vaccination.

They also protect the children who cannot safely receive certain vaccines. This is an important distinction that often gets lost in the public debate. A child with a medically diagnosed autoimmune condition, immune deficiency, serious allergic reaction, or other legitimate contraindication should be evaluated by a physician. Families in that situation should speak directly with their doctors about vaccine safety, timing, risks, benefits, and whether a medical exemption is appropriate.

Medical exemptions should remain available for children who truly need them.

But broad non-medical exemptions create a different problem. If too many families opt out for non-medical reasons, the school community becomes less protected. That increases the risk for the very children who depend most on community immunity.

Religious Liberty Is Important — But So Is Public Health

Religious liberty is a foundational constitutional value. Parents also have a deeply important role in directing the upbringing of their children. Those principles should not be dismissed.

But constitutional rights have always existed in a society where the state may take reasonable steps to prevent serious harm to others. School vaccination laws are not new. They are part of a long history of public-health measures designed to prevent the spread of dangerous communicable diseases.

The hard question is where to draw the line. For the Second Circuit, New York’s law stayed on the constitutional side of that line because it applies across schools, does not target religion, and preserves medical exemptions for children who cannot safely be vaccinated.

If the Supreme Court takes the case, it may have to decide whether that reasoning remains enough under the Court’s modern religious-liberty doctrine.

What Happens Next?

The most likely next step is another petition to the United States Supreme Court. The plaintiffs will likely argue that the Second Circuit failed to meaningfully apply Mahmoud and that New York’s law burdens religious parents by forcing them to choose between their beliefs and school attendance.

New York will likely respond that the Second Circuit got it right: vaccine mandates are classic public-health laws, medical exemptions are different from religious exemptions, and states must be able to protect school communities from outbreaks.

If the Supreme Court denies review, New York’s law remains in place and the Second Circuit decision stands.

If the Supreme Court grants review, the case could become a major national test of whether states may continue to eliminate religious exemptions from school vaccine mandates.

The Bottom Line

The Second Circuit’s decision is an important reaffirmation of the state’s authority to require vaccination for school attendance while preserving medical exemptions for children who truly need them.

In my view, that balance matters. Children should be protected. Schools should be able to operate safely. Outbreaks should be rare, limited, and controlled. And families whose children have medically diagnosed autoimmune conditions or other legitimate contraindications should work with their physicians to determine whether vaccination is safe and whether a medical exemption is appropriate.

This case may now be headed back to the Supreme Court. If it gets there, the Court will not merely be deciding a technical constitutional issue. It will be deciding how far states can go to protect children, schools, and communities in an era where vaccine policy has become one of the country’s most divisive public-health debates.