This year marks the 100th anniversary of a deadly flu pandemic which killed an estimated 50 million people and infected at least one in five of the world's population.
In Ireland, 20,057 deaths were officially recorded. This short explainer was produced by Hiromi Mooney and features Dr Ida Milne.
For all the stories from 100 years ago, visit [ Ссылка ]
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Learn about the Easter Rising: [ Ссылка ]
Learn about the Gallipoli campaign during WW1: [ Ссылка ]
