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World TB Day World TB Day is observed each year on March 24 to commemorate
the date in 1882 when Robert Koch announced the discovery of
Mycobacterium tuberculosis, the bacterium that causes TB. Worldwide,
TB remains one of the leading causes of death from infectious
disease. An estimated 2 billion persons (i.e., one third of the
world's population) are infected with M. tuberculosis. World
TB Day provides an opportunity to communicate TB-related problems
and solutions and to support worldwide TB-control efforts.
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