An ancient scourge, tuberculosis has made a comeback in recent years. According to a recent World Health Organization report, tuberculosis (TB) incidence increased by one percent in 2003.
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Though one-third of the world's population carries latent TB, roughly eight million people per year experience progression to the active form of the disease. Prevalence and mortality have gone down, however, since the early 1990s, meaning that while the number of cases has increased, TB control programs are finding and curing increasing numbers.