A timeline that documents the years in which pandemics occurred over the past century, as well as the years in which bird flu strains made the jump to people.
The influenza pandemic of 1918, also known as the Spanish Flu, remains the most deadly in recent history. Death estimates ranging between 20 and 40 million people worldwide. Researchers are delving into old samples and historic records out to answer why.
Researchers investigate various approaches to preventing an influenza pandemic.
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Last Updated October 13, 2010