Tuberculosis FACT SHEETS

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Latent TB infection

What is latent TB infection?

You have latent tuberculosis (TB) infection if you have breathed TB germs (bacteria) into your lungs and your immune (body defence) system has stopped them from growing. The TB germs remain alive but inactive in your body. You don’t feel sick and can’t pass TB to others.

Treatment of latent TB infection is important because it can prevent the development of active TB disease later in life.

How do I know if I have latent TB infection?

If you have latent TB infection, you won’t feel sick. You may not know you have been exposed to TB. The best way to find out is to get a TB skin test. If you know you are infected with TB, ask to be tested for HIV. It’s important to know if you have HIV because it can may your body defence (immune) system weak and increase your risk of developing active TB disease.

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