United States

The hardest-to-treat form of drug-resistant tuberculosis is a growing threat in many parts of the world, but remains quite rare in the United States, government health researchers said on Nov. 11. From 1993 through 2007, there were 83 cases of extensively drug-resistant TB, or XDR-TB, reported in the US, Centers for Disease Control and Prevention researchers wrote in the Journal of the American Medical Association. XDR-TB defies nearly all drugs used to treat tuberculosis, the top cause of infectious disease death among adults worldwide. It is more difficult to treat than the more common multidrug resistant TB, or MDR-TB. (Reuters)

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