This Week in Science

In Science this week, a team led by University of Tubingen researchers report the sequencing and analysis of the genomes of medieval and modern Mycobacterium leprae, the pathogen responsible for leprosy, using ancient skeletons and existing patients. They found that the bacterium has not changed much genetically over the past millennium, with only about 800 mutations occurring among the 16 genomes examined, and that strains from the Americas most likely originated in Europe.

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