The story of the H1N1 virus that killed up to 100 million people worldwide between 1918-1920, making it deadlier than any war.

[00:00.15]The deadliest pandemic in human history began quietly in the spring of 1918 in rural Kansas.
[00:07.01]At Camp Funston, a military cook named Albert Gitchell woke up with what seemed like an ordinary flu fever, sore throat, headache.
[00:15.96]But this was no ordinary virus.
[00:18.28]Within hours, dozens of soldiers were bedridden.
[00:21.76]Within weeks, the infection had spread across America and jumped the Atlantic Ocean.
[00:27.42]Scientists now believe this H1N1 influenza strain may have originated in birds before making the deadly leap to humans.
[00:36.81]What made this virus so different was its genetic makeup.
[00:40.40]It contained genes from both human and animal flu viruses, creating a pathogen that human immune systems had never encountered before.
[00:48.70]The virus was perfectly adapted to spread between people through respiratory droplets, and it could survive on surfaces for hours.
[00:56.68]Most mysteriously, it seemed to target the healthiest members of society, turning their own robust immune systems against them.

The deadliest pandemic in human history began quietly in the spring of 1918 in rural Kansas. At Camp Funston, a military cook named Albert Gitchell woke up with what seemed like an ordinary flu—fever, sore throat, headache. But this was no ordinary virus. Within hours, dozens of soldiers were bedridden. Within weeks, the infection had spread across America and jumped the Atlantic Ocean. Scientists now believe this H1N1 influenza strain may have originated in birds before making the deadly leap to humans. What made this virus so different was its genetic makeup—it contained genes from both human and animal flu viruses, creating a pathogen that human immune systems had never encountered before. The virus was perfectly adapted to spread between people through respiratory droplets, and it could survive on surfaces for hours. Most mysteriously, it seemed to target the healthiest members of society, turning their own robust immune systems against them.

The Spanish Flu: History's Deadliest Pandemic

The Mysterious Beginning