The Difference Between Latent TB Infection and Active TB Disease

This information sheet discusses tuberculosis (TB) and the difference between the two TB-related conditions: latent TB infection (LTBI) and TB disease. It explains what is meant by LTBI, and, that although persons with LTBI cannot spread the disease, if left untreated, they can develop active TB in the future. The information sheet also describes active TB disease, its symptoms, and the need for treatment.