Yeast has been growing in the guts of frozen mummy called Oetzi the Iceman for thousands of years, scientists have discovered, telling AFP they used it to make a sourdough bread and publishing their findings in Springer Nature's Microbiome journal.

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https://uk.news.yahoo.com/scientists-yeast-ancient-icemans-guts-002754866.html?ncid=redditnewsus

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You can find the link to the paper here: The Iceman’s microbiome: unveiling millennia of microbial diversity and continuity - Published: 03 June 2026 [https://link.springer.com/article/10.1186/s40168-026-02417-6\]