Ancestor of Bubonic Plague Bacteria Found in 3,800 Year-Old Teeth
In the teeth of 3,800 year-old human skeletons, scientists have found a historically important bacteria. The pulp of these teeth was home to the ancestor of the bacteria that would one day cause the bubonic plague.
from http://www.newsweek.com/ancestor-bubonic-plague-bacteria-found-3800-year-old-teeth-967993
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