We’re hitting 90 years since the great Spanish flu pandemic of 1918, which experts estimate infected from one-fifth to one-third of the world's population.
Studying how the influenza outbreak affected so many people gives researchers today a window onto the mechanism of deadly mass infections. Have you heard stories about life during that time? Can any of your relatives recall World War I and scientific breakthroughs at that time? Can you?
Dig out your old photos and share stories of flu treatment during the early 1900s. Share your story on iReport.com.

