The number of people who caught tuberculosis last year inched downward, according to an estimate by the World Health Organization, but the agency warned that drug-resistant strains are still spreading. In a report issued Wednesday, the UN agency estimated there were about 8.7 million new cases of TB last year, down from about 8.8 million in 2010. The number of deaths was unchanged at about 1.4 million — making it the second-leading killer among infectious diseases, after AIDS.
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