LONDON (AP) - A World Health Organization report warns that drug-resistant tuberculosis is spreading even faster than medical experts had feared.
The U.N. agency says the level of TB patients infected with the drug-resistant strain topped 20 percent in some countries, which is the highest ever recorded.
The director of WHO's "Stop TB" department says numbers like that demonstrate what happens when there are continuous "mistakes" in TB treatment.
Though the report is the largest survey of drug-resistant TB, based on information collected between 2002 and 2006, data were available from only about half of the world's countries. And experts say it is likely that patients, and even entire outbreaks of drug-resistant TB, were being missed.
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