to be ineffective, but developed for diagnosis of tuberculosis after his death. The day he announced the discovery of the tuberculosis bacterium, 24 March 1882, has been observed by the World Health Organization as "World Tuberculosis Day" every year since 1982.

Early life and education

Koch was born in Clausthal, Germany, on 11 December 1843, to Hermann Koch (1814-1877) and Mathilde Julie Henriette

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