Several studies have dealt with the idenficiation of aDNA of Yersinia pestis. There are several arguments for a mutation of Y. pestis shortly before the 1347-53 pandemic. Probably there were different variants of Y. pestis involved. In order to understand the historical ecology of the Black Death and the role of 14th-century land-use practices and climate changes it will be crucial to trace the development of Y. pestis .
To date Y. pestis has been extracted from human skeletal remains at the following locations:
Yersinia pestis – larger map
(additions are welcome)