Vaccination and Immunization Requirements Before You Can Enroll at a US University

Why this is required before you enroll

US universities enforce immunization rules to protect the whole campus, not to single out international students. State laws often set a baseline for colleges, and each school layers additional requirements from the American College Health Association's immunization recommendations on top. Miss the deadline and most schools place a registration hold on your account, which blocks you from enrolling in or changing classes until you submit proof.

The vaccines schools ask for most often

MMR (measles, mumps, rubella)

Students without documented immunity need two doses of the MMR vaccine, given at least four weeks apart. If you already received two doses as a child but cannot locate the paper record, a blood titer test showing immunity works as a substitute at most schools.

Meningococcal ACWY

The CDC recommends this vaccine for incoming students living in residence halls, and most universities require one dose given on or after your 16th birthday. Some schools extend the requirement to anyone under 21 to 23 regardless of housing, so check your specific school's rule rather than assuming it only applies to dorm residents.

Varicella (chickenpox)

If you do not have documented proof of two childhood doses or a confirmed case of chickenpox, you need two doses of the varicella vaccine, spaced four to eight weeks apart, or a titer confirming immunity.

Tuberculosis screening

Many schools add a TB screening step for students arriving from countries with higher TB rates, using a blood test (an IGRA) rather than the skin test common in other countries, since the skin test sometimes gives a false positive in people who already received the BCG vaccine as children. Requirements and the list of countries covered vary by school, so check your health center's international student page directly.

Vaccines often recommended but not required

Many schools recommend, without requiring, an annual flu vaccine, a Tdap booster if your last one is more than 10 years old, and Hepatitis B for students without documented immunity. The ACHA's immunization recommendations list these alongside the mandatory group as good practice for college-age students living in close quarters. Check your own school's page to see which of these move from recommended to required, since a few schools require Hepatitis B or Tdap outright.

Why requirements differ between schools

Immunization rules come from a mix of state public health law, the state university system's own policy, and each school's judgment about outbreak risk in shared housing. A public university in one state can require a vaccine that a private university in another state only recommends. This is why a student transferring between two US schools sometimes has to submit an updated immunization form even with no change in personal health history.

What a missed deadline actually blocks

A registration hold from an incomplete immunization file usually blocks class registration first, but at many schools it also blocks moving into housing, since the school treats vaccination as a condition of dorm life alongside academics. Clear the hold as early as possible after arrival, since the wait for a titer result or a repeat vaccine appointment sometimes takes a few business days on a busy campus.

What a titer is, and when you need one

A titer is a blood test that measures the antibodies you already carry against a specific disease. Schools accept a titer in place of a vaccine record when you cannot find your childhood paperwork, but the lab report needs to show the actual antibody number and its reference range, or state plainly that you are immune. A titer that only says "tested" without a value or range usually gets rejected, so ask your lab for the full report before you submit it.

Submitting records from a foreign school system

• Translate any record not already in English, and keep the original alongside the translation.

• Records from a national vaccination card, a WHO booklet, or your home doctor's clinic are accepted at most schools if they list the vaccine name and the date given.

• If a record is incomplete or unreadable, expect the school to ask you to repeat the vaccine or get a titer instead, both usually available at the campus health center after you arrive.

• Upload everything through your school's health portal, the same system that manages your patient file once you enroll.

If you arrive without complete records

Most campus health centers give missing vaccines or draw a titer once you arrive, often within your first week. Budget for this: even with SHIP active, a vaccine given on campus sometimes carries a small administration fee, so check whether your plan covers it before the visit. Getting this sorted in your first week avoids a registration hold hitting you right before the add or drop deadline for classes.

Building a personal vaccine record for your time in the US

Keep a copy of every vaccine and titer result the campus health center gives you, separate from the file the school holds. You will likely need this record again if you transfer schools, apply for a job placement with its own health requirements, or travel internationally during your degree. A phone photo of each report is enough, as long as the vaccine name, date, and provider are readable.