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b'LONDON\\u2014 At the London School of Hygiene and Tropical Medicine parties, a talk, and an exhibition on World Tuberculosis Day are commemorating the 24th of March 1882 when Robert Koch from Germany announced his discovery of the M.tuberculosis bacterium that causes tuberculosis. Sarah Maxwell hears from Ruth McNerney how the threat from TB still looms in many parts of the developing, and \\u2014 surprisingly \\u2014 developed world, and about the need for more research and better diagnostic tests.'