GENETIC LINEAGE. “Yersinia pestis evolved from the closely related zoonotic enterobacterium Y. pseudotuberculosis to become one of the most virulent pathogens known to humans. Its recent identification in ancient human material from Altai, Siberia suggests it caused human infections as early as 5,000 years ago, though its ability for flea-borne transmission leading to bubonic disease might have been absent in these older, divergent lineages.”
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