Hi does anyone know what have lead to TB becoming drug resistant?

hi does anyone know what has led to TB becoming drug resistant? and some facts about tuberculosis surrounded by south africa?
Answers:    Patients become resistant because they stop taking their medications before the end of the treatment. These patients are still sick and infect other individuals which in fact will also be resistant to those medications that the initial infected character. The doctors then have to take a different approach and start them bad with a different group of medicines to try to kill the disease.


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