Secrets of plague bacterium revealed by mass grave

WorldEnvironment
28 Aug 2025 • 7:43 PM MYT
The Independent
The Independent

The world’s most free-thinking newspaper

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  • Scientists have successfully deciphered the genome of Yersinia pestis, the bacterium responsible for the Justinian Plague, from a mass grave in Jerash, Jordan.
  • This discovery provides definitive biological proof that Yersinia pestis caused the devastating pandemic, resolving a long-standing historical mystery.
  • The research confirmed the bacterium was present within the Byzantine Empire between 550AD and 660AD, with victims carrying nearly identical strains, indicating a rapid and widespread outbreak.
  • A companion study revealed that Yersinia pestis circulated for millennia before the Justinian outbreak
  • It also showed that subsequent plague pandemics originated independently from animal reservoirs, not a single ancestral strain.

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