Long before it evolved the genetic machinery that would help make bubonic plague one of history's most feared diseases, the bacterium Yersinia pestis was already capable of unleashing deadly outbreaks. Now, researchers have uncovered evidence that plague swept through hunter-gatherer communities around Lake Baikal in Siberia around 5,500 years ago. The findings suggest the disease was capable of killing people in concentrated outbreaks centuries before the emergence of the flea-borne form that

Tag-uri: DNA