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The 1918 influenza pandemic (January 1918 – December 1920; colloquially known as Spanish flu) was an unusually deadly influenza pandemic, the first of the two pandemics involving H1N1 influenza virus . [1] It infected 500 million people around the world, [2] including people on remote Pacific islands and in the
Arctic, and resulted in the deaths of 50 to 100 million (three to five percent of the world’s population), [3] making it one of the deadliest natural disasters in human history.