Latent TB happens when a person has small numbers of TB bacteria within their body. They are kept under control by the body’s immune system. A person with latent TB does not have any symptoms because the bacterias are kept under control by the body's immune system. A person affected with latent TB cannot pass the bacteria on to other people. One-quarter of the global population is infected with latent TB and 10 per cent of these will develop active TB. However a new treatment for latent tuberculosis is set to tackle the global epidemic. According to a study by