This is not to say that there aren't certain people who could eat ancient strains of wheat under certain conditions and be healthy. (doctorakil.com)
But it wasn't just any gut microbe — this early farmer was infected with a particular ancient strain of Helicobacter pylori bacteria that is most similar to modern Asian strains. (sciencemag.org)
Scientists have used DNA analysis to study ancient strains of tuberculosis, work that has helped them understand how the bacteria has evolved through the centuries. (scientificamerican.com)