Although researchers continue to debate the exact location where the pandemic began, there is no credible evidence that anything other than H1N1, a type of influenza A virus, was responsible for it.

CNN — Pandemic: It's a scary word. But the world has seen pandemics before, and worse ones, too. Consider the influenza pandemic of 1918, often referred to erroneously as the "Spanish flu." ...

Scientists in Switzerland have cracked open a century-old viral mystery by decoding the genome of the 1918 influenza virus from a preserved Zurich patient. This ancient RNA revealed that the virus had ...

A pair of lungs preserved over a century ago from a deceased Spanish flu patient has helped unravel the genetic adaptations undergone by the virus to spread across Europe during the start of the 1918 ...

The 1918 influenza pandemic remains the deadliest in modern history, killing tens of millions — and leaving scientists with enduring questions about how it began. A century later, a virologist and ...

For years, internet users have shared a rumor about U.S. Health Secretary Robert F. Kennedy Jr. falsely claiming that vaccines caused the 1918-1919 influenza pandemic known as the Spanish flu. One ...