Skip to Content
Home > Wellness > Health Library > Latent Tuberculosis Infection
Browse and register for related classes.
A latent (inactive) tuberculosis (TB) infection is the
presence of TB bacteria in a person's lungs even though he or she does not have
symptoms of TB (such as coughing, weight loss, fatigue, or fever).
A person with latent tuberculosis infection has no signs of active TB on
a chest X-ray, and no TB-causing bacteria can be found in the mucus from the
person's lungs (sputum). The only proof that the person has a TB infection is a
positive TB skin test or TB blood test (interferon-gamma release assay or IGRA).
People who have a latent TB
infection do not spread the disease to other people. They may need to take
medicine to prevent the bacteria from becoming active in the future.
Current as of:
May 22, 2015
E. Gregory Thompson, MD - Internal Medicine & R. Steven Tharratt, MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2015 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.
250 Pleasant Street
Concord, NH 03301
Contact Concord Hospital
View Quality Data
© 2016 Concord Hospital