Teeth showed the plague was around for centuries before it wiped out about 25 million people.
. It is likely that the LNBA strain was not transmitted on fleas, unlike later strains of the plague, such as the one that caused the Black Death in the Fourteenth Century.The team is not fully certain that the individuals at these old burial sites were infected with the exact same strain of plague, since pathogenic DNA that causes disease degrades very quickly in samples that could be incomplete or eroded.
The Somerset site is also rare since it doesn’t match other funeral sites dating back to this time period. The individuals buried there appear to have died from trauma. The team believes that the mass burial here was not due to an outbreak of plague, but the individuals studied may have been infected when they died.
“We understand the huge impact of many historical plague outbreaks, such as the Black Death, on human societies and health, but ancient DNA can document infectious disease much further into the past,” co-author and geneticist at the Francis Crick Institute Pontus Skoglund.
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