It can be inferred from the text provided that the author believes the bacterium is the ____ cause of the recurrences of black death.
An international team of researchers has uncovered new information about the Black Death in Europe and its descendants, suggesting it persisted on the continent over four centuries, re-emerging to kill hundreds of thousands in Europe in separate, devastating waves. The findings address the longstanding debate among scientists about whether or not the bacterium Yersinia pestis – responsible for the Black Death – remained within Europe for hundreds of years and was the principal cause of some of the worst re-emergences and subsequent plague epidemics in human history.
Until now, some researchers believed repeated outbreaks were the result of the bacterium being re-introduced through major trade with China, a widely-known reservoir of the plague. Instead, it turns out the plague may never have left.
Retrieved from: http://esciencenews.com/articles/2016/01/25/descendants.black.death.confirmed.source.repeated.european.plague.outbreaks
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