Typical symptoms of TB include:
You should see a GP if you have a cough that lasts more than 3 weeks or you cough up blood.
TB is a bacterial infection. TB that affects the lungs (pulmonary TB) is the most contagious type, but it usually only spreads after prolonged exposure to someone with the illness.
In most healthy people, the body's natural defence against infection and illness (the immune system) kills the bacteria and there are no symptoms.
Sometimes the immune system cannot kill the bacteria, but manages to prevent it spreading in the body.
You will not have any symptoms, but the bacteria will remain in your body. This is known as latent TB. People with latent TB are not infectious to others.
If the immune system fails to kill or contain the infection, it can spread within the lungs or other parts of the body and symptoms will develop within a few weeks or months. This is known as active TB.
Latent TB could develop into an active TB disease at a later date, particularly if your immune system becomes weakened.
With treatment, TB can almost always be cured. A course of antibiotics will usually need to be taken for 6 months.
Several different antibiotics are used because some forms of TB are resistant to certain antibiotics.
If you're infected with a drug-resistant form of TB, treatment with 6 or more different medications may be needed.
If you're diagnosed with pulmonary TB, you'll be contagious for about 2 to 3 weeks into your course of treatment.
You will not usually need to be isolated during this time, but it's important to take some basic precautions to stop the infection spreading to your family and friends.
The BCG vaccine offers protection against TB, and is recommended on the NHS for babies, children and adults under the age of 35 who are considered to be at risk of catching TB.
The BCG vaccine is not routinely given to anyone over the age of 35 as there's no evidence that it works for people in this age group.
At-risk groups include:
If you're a healthcare worker or NHS employee and you come into contact with patients or clinical specimens, you should also have a TB vaccination, irrespective of age, if:
Parts of the world with high rates of TB include:
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