Evaluation of a Novel Microbiological Diagnostic Test for Latent Mycobacterium Tuberculosis Infection

Tuberculosis (TB) is an infection caused by tiny germs. Most of the time, these germs affect the lungs. People usually catch TB if they breathe in germs coughed into the air by someone with active TB. For many, the germs stay 'dormant' in the body, meaning they don't cause any sickness. However, about 1 in 10 people with dormant TB will eventually become ill with active TB, which can cause symptoms like a persistent cough and losing weight.

There's good news: dormant TB can be treated with antibiotics over three months, which helps prevent it from turning into active TB. The problem is, current tests for dormant TB don't look for the germs themselves; they simply check for your body's reaction to the germs. This means these tests don't change after you've been treated, so doctors can't tell if the treatment has actually worked. Also, these tests can't tell who among those with dormant TB will get sick and who won't, leading to many more people taking antibiotics than truly need them.

Recently, some scientists in Germany had an exciting breakthrough. They developed a new, very sensitive blood test that seemed to find tiny numbers of TB germs directly in the blood of a few people with dormant TB. This was a big deal because finding the actual germs in dormant TB has been very difficult. This research study wants to check if these exciting findings are true by testing this new blood test in a larger group of about 100 people, including those with and without dormant TB. If this new test proves accurate, it could completely change how we diagnose and treat dormant TB in the future.