What Do You Know About Tuberculosis?
Many people think tuberculosis (TB) is no longer a threat, but it's still a leading killer worldwide. One-third of the world’s population (2 billion people) is infected with Mycobacterium tuberculosis, the bacterium that causes TB.
1. How do you get TB?
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Tuberculosis is a disease that can affect any part of the body, but the infection most often targets the lungs. Most TB cases are caused by inhaling the bacterium. People can contract TB when an infected person coughs, sneezes, speaks, sings, or laughs. Although tuberculosis has been around for thousands of years, it did not become a major health problem until the Industrial Revolution, when crowded living conditions helped it spread. In the 17th and 18th centuries, TB caused a quarter of all adult deaths in Europe. Only the active form of the disease is contagious. Some people have inactive TB, or latent TB, which cannot be spread to other people unless it becomes activated for some reason.
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