3. The Spanish Flu (1918-1919)
The Spanish Flu pandemic swept across the globe with staggering speed, claiming more than 50 million lives. No continent was spared, and the sheer scale overwhelmed health systems everywhere. This deadly influenza didn’t just cause mass casualties—it spurred the evolution of public health practices and international cooperation in disease response. Lessons learned from this pandemic directly influenced how future outbreaks, including COVID-19, would be handled. Its legacy endures in the protocols and preparedness that define modern global health. Read more from the CDC.
