The tuberculosis (TB) vaccine is not required for school entry anywhere in the United States. The vaccine, known as BCG, is not part of the routine childhood immunization schedule and is rarely used in this country. What some states do require is TB testing, which is a skin test or blood test to check whether a child has been exposed to tuberculosis. The distinction matters: no school will ask for proof of TB vaccination, but depending on your state, your child may need a TB test before enrolling.
Why the US Doesn’t Use the TB Vaccine
The BCG vaccine is widely used in many countries around the world, particularly in regions where tuberculosis is common. The United States took a different approach decades ago. Because the general population here faces a low risk of TB infection, federal health authorities determined that a mass vaccination policy wasn’t warranted. Instead, the US strategy relies on identifying and treating people who have been exposed to TB through targeted testing and preventive treatment.
There’s also a practical reason the US avoids routine BCG vaccination: the vaccine causes false positives on TB skin tests. Once someone has received BCG, there is no reliable way to tell whether a positive skin test result means they were actually infected with TB or are simply reacting to the vaccine. Since TB skin testing is a cornerstone of how the US monitors and controls tuberculosis, widespread BCG vaccination would undermine that entire system. The CDC notes that BCG is only considered for people who meet very specific criteria and only after consultation with a TB expert.
What Schools Actually Require: TB Testing
Several states require some form of tuberculosis screening before a child can enroll in school. This is not a vaccine. It’s either a skin test (where a small amount of protein is injected under the skin of the forearm and checked 48 to 72 hours later) or a blood test that measures the immune system’s response to TB bacteria.
Pennsylvania, for example, requires TB testing when a student first enters school and again in ninth grade. New Jersey requires testing for students entering the school system from countries with high TB rates. The specifics vary significantly from state to state, and many states have moved toward a risk-based approach rather than blanket testing of all students. In Pennsylvania, school boards can even apply for a modification that eliminates routine testing for students and limits it to high-risk groups only.
If your child’s school requires TB screening, the enrollment paperwork will specify it. Your pediatrician’s office can typically perform the test during a routine physical.
How Risk-Based Screening Works
Many schools and pediatricians now use a questionnaire to determine whether a child actually needs a TB test rather than testing every student. A widely used tool developed by the Global Tuberculosis Institute at Rutgers asks parents a series of questions covering:
- Symptoms: persistent cough, fever, night sweats, unexplained weight loss, unusual fatigue, or loss of appetite
- Exposure: whether the child has spent time with someone sick with TB or lived with someone who has a long-lasting cough
- Travel or origin: whether the child or parent was born in or has recently traveled to regions where TB is more common, including parts of Asia, the Middle East, Africa, Latin America, Eastern Europe, or the former Soviet Union
- Recent visitors: whether anyone from outside the US has stayed in the home for at least 14 days in the past two years
- Medical conditions: HIV, diabetes, serious kidney disease, weakened immune system, organ transplant, or use of immune-suppressing medications like steroids
If the answers to all these questions are negative, the child is generally considered low risk and may not need formal testing. If any answer is yes, the pediatrician will recommend a skin test or blood test to check for TB infection.
If Your Child Was Vaccinated With BCG Abroad
Children who were born in another country or whose families immigrated to the US often received the BCG vaccine as infants. This creates a common headache when schools require TB testing, because BCG vaccination frequently causes a positive result on the standard TB skin test even when the child does not have TB.
The CDC recommends that children who received BCG get a TB blood test (called an IGRA) instead of the skin test. BCG vaccination does not cause false positives on blood tests, making them far more reliable for this group. This is especially important in the first two years after vaccination, when skin test reactivity is most likely. If your child received BCG and the school requires TB screening, ask your pediatrician specifically for the blood test to avoid unnecessary follow-up from a misleading skin test result.
Regardless of BCG history, any positive test result will be evaluated the same way. The child’s doctor will assess symptoms, may order a chest X-ray, and will determine whether the result reflects a true infection that needs treatment.
Exemptions From TB Testing
States that mandate TB screening generally allow exemptions under certain circumstances. In New Jersey, for instance, testing is not required for students who have attended school in another US state before transferring into the New Jersey system. Students entering preschool through fifth grade are exempt if they have documentation of a previous TB test done at age three or older. Students entering grades six through twelve are exempt with a documented negative test from the past six months or any documented positive test, regardless of when it was done.
Religious exemptions also exist in some states. In New Jersey, parents who object to TB testing on religious grounds can submit a written statement explaining how the test conflicts with their religious practices. General philosophical or moral objections are not accepted. When a religious exemption is granted, the school conducts a symptom assessment instead, and if any TB-like symptoms are reported, a physician must confirm the student does not have active disease.
College TB Requirements
While K-12 TB testing rules vary by state, colleges and universities often have their own screening requirements, particularly for international students. Some states give their health departments explicit authority to mandate TB testing on campuses. Arkansas, for example, identifies colleges and universities as populations at risk for TB infection and authorizes the state health department to require testing for communicable diseases on campuses.
If you’re an international student or the parent of one heading to a US university, expect to encounter a TB screening requirement during the enrollment or orientation process. This typically involves a skin test or blood test, and sometimes a chest X-ray. Check with your specific school’s health services office for their exact requirements, as these are set at the institutional or state level rather than federally.