Tuberculosis (TB) is contagious and spreads through the air. If not treated, each person with active TB can infect on average 10 to 15 people a year.
This is taken from the World Health Organisation's (WHO) website.
More than two billion people, equal to one third of the world’s total population, are infected with TB bacilli, the microbes that cause TB. One in every 10 of those people will become sick with active TB in his or her lifetime. People living with HIV are at a much greater risk.
There were 9.4 million new TB cases in 2009, of which 80% were in just 22 countries. Per capita, the global TB incidence rate is falling, but the rate of decline is very slow - less than 1%.
TB is a leading killer among people living with HIV, who have weakened immune systems.
A total of 1.7 million people died from TB in 2009 (including 380 000 people with HIV), equal to about 4700 deaths a day. TB is a disease of poverty, affecting mostly young adults in their most productive years. The vast majority of TB deaths are in the developing world, with more than half occurring in Asia.
For more facts click this link http://www.who.int/features/factfiles/tuberculosis/en/
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