Ötzi the Iceman has been dead for roughly 5,300 years, but he is not, in one narrow and unexpected sense, sterile. A new study in Microbiome reports that the mummy’s skin and tissue still host a living microbial community — not just fragments of ancient DNA, but organisms that have persisted and, in some cases, actively adapted to the conditions of modern museum conservation.
The work comes from the Institute for Mummy Studies at Eurac Research in Bolzano, Italy, working with material held at the South Tyrol Museum of Archaeology, where Ötzi has been kept in a purpose-built conservation chamber at a constant -6°C and 99% relative humidity since shortly after his discovery in 1991. The paper, led by Mohamed S. Sarhan alongside Marco Samadelli, Albert Zink and Frank Maixner, is titled “The Iceman’s microbiome: unveiling millennia of microbial diversity and continuity” (Microbiome, 2026, DOI: 10.1186/s40168-026-02417-6).
Two microbial populations, two very different origins
Sequencing turned up two distinct groups of organisms. The first is a set of ancient gut bacteria recovered from intestinal tissue and stomach contents — direct, if degraded, survivors of Ötzi’s own original digestive microbiome. The second is a population of cold-adapted yeasts, which the researchers believe most likely originated from the glacier that entombed and preserved his body, and which may have persisted on and in the tissue for thousands of years.
What makes the yeasts notable is not just that DNA traces of them survive, but that the organisms themselves appear to still be biologically active under the museum’s cold, humid storage regime — a genuinely living, currently-metabolizing community riding along on a specimen usually thought of as inert.
The phenol detail: microbiology meets conservation history
The most striking finding for anyone who works with irreplaceable physical specimens is a direct link between the microbiome and the mummy’s own conservation record. Of four yeast species identified, three carry the genetic capacity to metabolize phenol — a compound that was used in past conservation treatments to control fungal growth on the body after its discovery. The researchers suggest these yeasts may be using residual phenol as a nutrient source, meaning a chemical applied specifically to protect the specimen may now be shaping which organisms are able to thrive on it.
As Frank Maixner, director of the Institute for Mummy Studies at Eurac Research, put it: “These yeasts have accompanied Ötzi on his long journey through the millennia.”
Why this is a specimen-stewardship story, not just a curiosity
It’s easy to read a story like this as trivia — ancient mummy, weird microbes. But underneath it is a concrete example of continuous, active research-and-collections management applied to a unique, non-renewable biological specimen. Ötzi cannot be re-collected, resampled from a living population, or replaced; every conservation decision made about him, then and now, becomes part of the object’s own scientific record. Here, that record includes a chemical intervention from decades ago that is now measurably shaping the microbial community the object hosts today.
That is precisely the kind of finding that should feed back into conservation practice going forward: the Institute for Mummy Studies and the South Tyrol Museum of Archaeology are not simply storing the Iceman at stable temperature and humidity, they are monitoring what is biologically happening to him under those conditions, and that monitoring is now informing how the specimen should be handled and treated in future. It is a useful, if unusually vivid, illustration of what it means to treat a research specimen as something with an ongoing, documented custodial and scientific history rather than a static archival object.
Source
Mohamed S. Sarhan, Marco Samadelli, Albert Zink, Frank Maixner, “The Iceman’s microbiome: unveiling millennia of microbial diversity and continuity,” Microbiome 14, 2026. DOI: 10.1186/s40168-026-02417-6. Reported via ScienceDaily, August 7, 2026, based on materials provided by Eurac Research.
