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Scientists have mapped the genome of a strain of cholera extracted a century ago from a sick British soldier during World War I and found clues to how some cholera bacteria strains cause epidemics today.The strain was, however, distantly related to strains of cholera bacteria that are causing current outbreaks and have sparked epidemics in the past.The World Health Organization says the disease is "a global threat," and experts estimate there are between 1.3 million and 4 million cases and between 21,000 and 143,000 cholera deaths worldwide each year.Matthew Dorman, who co-led the research, said the analysis also revealed the 1916 strain had certain faults, including lacking a flagellum a thin tail that enables bacteria to swim.
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