Chile mummy DNA links smallpox arrival to Europeans

Genetic testing of mummified human remains in northern Chile has produced what researchers described as the first direct molecular confirmation that smallpox reached the Americas through European colonists. The evidence comes from viral DNA recovered from two individuals interred during the early colonial period, officials involved in the study said.

According to the researchers, sequencing of the samples identified a smallpox strain that is closely related to variants known from Europe. They said the genetic relationship supports historical accounts that the virus was brought across the Atlantic after European contact rather than circulating in the region beforehand.

Findings from the Camarones 9 site in northern Chile The viral genetic material was detected during analysis of remains from the Camarones 9 archaeological site, the study team said. The two individuals whose samples were sequenced were buried in the early colonial era, aligning the biological evidence with a period of rapid political and demographic change in the region.

Researchers said the data places the infection within a window between 1492 and 1631 C.E. They noted that this timeframe corresponds with the broader timeline of Spanish expansion into parts of the Americas, including areas that would have been connected through colonial movement and settlement.

Why the genetic signal matters for historical records

Officials familiar with the research said the results validate a long-held historical hypothesis: that smallpox spread into Indigenous communities that did not have prior immunity. By tying a specific viral lineage in the Americas to European-related variants, the genetic evidence provides a biological counterpart to documentary narratives of epidemic disease following colonization.

Chile The The researchers said the presence of smallpox in these remains also supports the view that the disease played a significant role in population loss among Indigenous societies. In the study’s framing, widespread mortality would have affected social structures and governance, with consequences that intersected with the consolidation of colonial control.

Ancient DNA and the limits of what the study can show The study highlights how ancient DNA methods can help reconstruct past outbreaks and clarify when and where particular pathogens circulated, researchers said. They described this approach as a way to test historical hypotheses using molecular traces preserved in human remains.

At the same time, the findings come from two individuals at a single archaeological site, leaving open questions about how widely the identified strain spread across different regions and communities during the same period. Researchers said further ancient DNA work could help map patterns of transmission more precisely, but the reported evidence already directly links early colonial-era burials in northern Chile to a European-related smallpox lineage.