Researchers analyzing ancient DNA from 500-year-old Inca mummies in Chile have found the first molecular evidence that European colonists introduced smallpox to the Americas, confirming a catastrophic chapter of colonial history that killed millions of Indigenous people.
The study examined mummified remains preserved in Chile's dry climate, where naturally desiccated bodies retain biological material for centuries. Scientists extracted and sequenced viral DNA from the mummies, identifying the smallpox virus with precision that previous archaeological and historical methods could not achieve. This genetic evidence directly links the virus found in these Indigenous individuals to strains brought from Europe during the early colonial period.
Smallpox decimated Indigenous populations across the Americas following European contact in 1492. Contemporary accounts describe entire communities wiped out within years, yet direct proof of the pathogen's presence in pre-Columbian remains remained elusive until now. The new research transforms this historical narrative from circumstantial evidence into genetic fact.
The mummies tested came from populations in the Andes region, where the Spanish conquest began in earnest in the 1530s. Dating the remains to approximately 500 years ago places them near or during initial contact periods. The discovery that these individuals carried the smallpox virus confirms the rapid spread and devastating impact of Old World diseases on Indigenous communities who lacked immunity.
This work represents a methodological breakthrough in paleopathology. Rather than relying solely on skeletal markers or historical documentation, researchers can now extract pathogenic DNA from ancient remains and identify specific viruses. Such techniques may reveal other epidemic diseases that shaped colonial encounters.
The findings carry weight beyond historical curiosity. They document biological catastrophe at the molecular level, quantifying in DNA what killed an estimated 90 percent of the Indigenous population of the Americas over the following centuries. The research validates Indigenous oral histories and written accounts that colonial powers brought plague-like devastation