The pandemic known as Justinian's plague was likely caused by:

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The pandemic known as Justinian's plague, which ravaged the Byzantine Empire in the 6th century, was likely caused by the bacteria Yersinia pestis, the same bacteria responsible for the Black Death several centuries later in Europe. Recent genetic analysis of the DNA from teeth of Justinian plague victims supports this theory. Other options listed are not known to have caused the Justinian plague.

The Pandemic Known as Justinian's Plague Was Likely Caused By