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Emanuel Edward Klein FRS (31 October 1844 at Osijek – 9 February 1925 at Hove) was a bacteriologist who was born in Croatia and educated in Austria before settling in Britain. He is sometimes known as the father of British microbiology, but most of his work in microbiology, histology, and bacteriology was overshadowed during his life by his use of and apparently outspoken support for animal vivisection in physiological and medical experiments. His English was poor and during court questioning, many of the answers he provided were considered shocking.