Disturbingly, there were an estimated 500,000 cases of multidrug-resistant (MDR) tuberculosis in 2007, and 55 countries had reported cases of extensively drug-resistant (XDR) tuberculosis by the end of 2008. Dr. Peter Donald and Paul van Helden write that these figures highlight a potential threat to our ability to treat tuberculosis.
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Donald et al. (2009) studied this question.
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