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What is TB?

Tuberculosis (TB) is an infectious disease caused by a germ called the tubercle bacillus. Tuberculosis is contagious - anyone can catch it. Some people are more at risk of catching TB than others.

The TB germ enters your body as you breathe. It usually settles in your lungs. From there, it can spread to other parts of your body, including your central nervous system, your bones, and your joints.

In Canada, TB control is very good, but there are still Canadians who get TB. Across the world, TB is considered one of the deadliest infectious diseases, especially in developing countries. In many places, the TB epidemic is made worse by the HIV/ AIDS epidemic. Read more about the world TB epidemic and how the Lung Association is involved in fighting TB.

TB can occur in animals, too.

Inactive TB: TB infection

When you are first infected with the TB germ, you don?t usually get sick right away. But the germ stays in your body, in an inactive state. This is called inactive TB.

The TB germ can become active at any time in your life. When the germ becomes active, it causes the disease known as tuberculosis or TB.

If you have inactive TB, you can take medicine to prevent the TB germ from becoming active and giving you TB disease.

Active TB : TB disease

Active TB means the TB germ in your body has become active, and has caused the disease TB. You will have symptoms of active TB disease, including cough, fever, weight loss, and more.