what is latent TB
Latent TB is when a person has TB bacteria in their body but there are no symptoms, so they donât feel unwell. You cannot pass latent TB on to others, but there is a risk that you will become ill with active TB later on, especially if your immune system is weakened, such as through another illness.ou have a greater risk of catching TB (active or latent) if you: 1  know someone who has had TB in their throat or lungs. 2  live or work in poorly ventilated or overcrowded conditions, where TB can spread more easily. 3  have links to areas of the world where TB is more common, such as Africa, Asia or Eastern Europe.