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The majority of cases in the world's largest outbreak of Ebola were caused by a tiny handful of patients, research suggests. The analysis shows nearly two thirds of cases (61%) were caused by 3% of infected people. The young and old were more likely to have been "super-spreaders". It is hoped understanding their role in spreading the infection will help contain the next outbreak. More than 28,600 people were infected with Ebola during the 2014-15 outbreak in west Africa and around 11,300 people died. [Source: BBC News]
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