Tuberculosis in Children: Exposure, Testing, and When to Seek Care

A family guide to TB exposure, screening, and next steps

MEDICALLY REVIEWED - APPROVED FOR WEBSITE PUBLICATION

This page is for general education only and does not replace individualized medical advice. This resource does not establish a doctor-patient relationship. For questions about your own child, contact your child's current healthcare professional.

Magnolia Pediatrics, Valley Children's Healthcare
2497 E. Herndon Avenue, Suite 101, Clovis, CA 93611 | 559-538-3070

Tuberculosis (TB) is an infection caused by bacteria. It is uncommon for many families, but prompt evaluation matters after a known exposure or an abnormal screening test. TB is spread through the air by a person with active TB disease of the lungs or throat; it is not spread by sharing dishes, touching clothing, or casual brief contact.

Urgent warning signs - check this first

Call 911 now for severe trouble breathing, blue or gray lips or face, a child who is limp or unresponsive, a seizure, or another life-threatening emergency.

Seek emergency medical care now for severe breathing difficulty, coughing up blood, confusion, severe headache or stiff neck, or a child who looks very ill.

When to contact your child's healthcare professional

A child has spent time with someone diagnosed with active TB disease, especially a household member or another person with whom the child has had regular indoor contact. Follow the instructions from the health department or the treating clinician.
A TB blood test or skin test is positive, or a school, travel, adoption, or immigration screening result needs follow-up. A positive test does not by itself mean active TB disease.
A cough lasting 3 weeks or longer, fever, night sweats, weight loss, poor appetite, unusual tiredness, chest pain, or swollen glands is present, especially with possible exposure.
A baby or child younger than 5, or a child with an immune-system condition or medicine that lowers immunity, has a possible exposure. Younger children need especially prompt guidance.

Inactive TB and active TB disease

Some people have TB germs in the body but are not sick and cannot spread TB; this is called inactive TB. Active TB disease means germs are multiplying and causing illness. A clinician uses the child's history, examination, testing, and sometimes chest imaging or other tests to tell the difference.

Testing and next steps

A clinician may use a TB blood test or a TB skin test. The best choice depends on the child's age, history, and whether the child received BCG vaccine outside the United States.
A positive screening test needs further evaluation. Keep a written record of the result and do not assume a positive test means the child is contagious.
Do not start or borrow medication. Treatment differs for inactive TB and active TB disease, and completing the prescribed plan is important.

What families can do now

Call ahead before a clinic visit if the child has symptoms and possible exposure so the office can advise about arrival and infection precautions.
Share exposure dates, travel history, prior BCG vaccination, prior TB test results, and any household member with cough, fever, or TB diagnosis.
Continue routine care unless the clinician or public-health team gives different instructions. Do not isolate a child solely because a screening test is positive; follow individualized advice.

Sources and medical review

Sources checked: August 15, 2026 | Medical review completed: August 15, 2026