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Measles and Back to School: What Your School Can Request About the Vaccination Record

October 30, 2026 · 6 min read

An ongoing measles outbreak has led one state to make the vaccination record mandatory for school attendance. Here’s what supports that measure and what your private school can do, whether or not it is in that state.

An Ongoing Outbreak

Mexico has been experiencing a measles outbreak since 2024 that has not ended. According to the Ministry of Health, cited by El Imparcial on July 30, 2026, as of July 27 of that year, the country had accumulated 19,074 confirmed cases since the outbreak began, with 45 deaths. Just in 2026 alone, 12,460 cases had been confirmed: Jalisco accounted for the majority, with 6,701 cases and three deaths, followed by Mexico City, with 1,013 cases and three deaths. Chihuahua, the state where the outbreak started, had accumulated 4,497 cases and 21 deaths by 2025, the highest death toll by state.

These are the most recent figures confirmed at the time of closing this note; since the outbreak is still active, they may have changed by the time you read this. If your school needs the current data, the report is updated by the Ministry of Health itself.

In response, Chihuahua was the first state to take a concrete school measure: its governor, Maru Campos, announced on July 29, 2025, that starting from the 2025-2026 school year, students and teachers at all levels—from basic to higher education—would need to present their vaccination record to attend classes. The revised coverage does not cite a decree or published agreement: it is a state government announcement, not (yet) a norm with a public number and text that can be cited article by article.

What the Law Specifically Says

The legal basis for requiring a vaccine or proof of vaccination is not an invention of each school: it is found in Article 144 of the General Health Law. It states, in what applies here:

> "Vaccination against communicable diseases, preventable by that means of immunization, deemed necessary by the Ministry of Health, shall be mandatory under the terms set by that agency and in accordance with the provisions of this Law."

This makes three things clear:

1. The obligation of a specific vaccine is declared by the Ministry of Health (federal or, by coordination, the state), not by the school on its own.

2. That obligation is set "under the terms determined" by the health authority: it can vary from one state to another, as happened with Chihuahua.

3. Outside of an express declaration from the health authority, the school can still request proof as a preventive measure within its own internal regulations—not as a legal obligation that is being violated by those who do not present it, but as a reasonable administrative requirement in the face of a real risk of contagion in a space where dozens of minors coexist.

What Each Level of Government Has Done, As Far As Could Be Confirmed

At the federal level, the SEP and the Ministry of Health reinforced surveillance and recommended reviewing the vaccination schedule—triple viral (MMR), double viral (MR), and boosters for hexavalent, rotavirus, and pneumococcus—when enrolling or re-enrolling (Excélsior, Aug 8, 2025). It is a recommendation with special attention, not a rule that obliges all private schools in the country to require the record: that rule was not found.

At the state level, in Chihuahua, the vaccination record is mandatory for attending classes at all levels starting from the 2025-2026 school year, by direct announcement from the governor. It is a government announcement, not a published decree that could be identified in the reviewed coverage.

In other states with active outbreaks—Jalisco, Mexico City, Zacatecas, Durango, among those with the highest cases and deaths in 2026—no equivalent school measure to that of Chihuahua was confirmed in the sources reviewed for this note. It is advisable to verify directly with the Ministry of Health or Education of each state, as it may change depending on the outbreak's progress.

And in your private school, wherever it is located, you can request the record as a preventive measure of your own internal regulations, backed by the public health objective of Article 144 of the General Health Law, even if your state has not yet issued an express mandate like that of Chihuahua.

What This Means for Your School

If your school is in Chihuahua, the requirement is no longer optional: there is an official announcement from the state government making it mandatory for all levels. If it is in another state, no one is yet obliging you by a published rule that we have been able to verify—but there is also nothing preventing you from doing so, and the public health argument is the same: an active outbreak, with tens of thousands of cases and documented deaths, in a space where students interact every day.

The important difference lies in how it is applied. One thing is to request the record as a requirement for enrollment and guide those who are missing a dose; another, very different, is to use it to deny entry to a student outright without further process. The former is a reasonable preventive measure. The latter can lead to a conflict with the family—and, if there is no express instruction from the health authority backing it, into a less solid legal ground.

Practical Checklist for This Enrollment or Re-enrollment

- Verify if your state has already issued an express instruction. Do not assume that what Chihuahua did applies the same in another state: confirm with the local Ministry of Health or Education.

- Request the National Health Record upon enrollment and re-enrollment. If the family has lost it, the IMSS allows it to be reprinted online; accept that proof while the physical document arrives.

- If a dose is missing, guide, do not exclude outright. Direct the family to the nearest health unit to complete the triple viral (MMR) or double viral (MR) vaccine, depending on the student's age, and give a reasonable deadline to resolve it.

- Explain in writing the reason for the requirement. A brief note to families—why it is requested, what is missing, how much time there is to complete it—prevents it from being seen as an arbitrary process.

- Keep a record that you reviewed the document. A simple log (date, student, status) supports you if later the state health authority asks about your internal control.

The outbreak is still ongoing. The most prudent approach, while that does not change, is to treat the vaccination record as a normal part of the enrollment process—with the same seriousness as reviewing a birth certificate or proof of address—and to stay informed about what the Ministry of Health in your state determines, which is, ultimately, the authority that can make this mandatory where it is not yet.