They discovered that the Black Death that devastated Europe between 1347 and 1350 was likely close to the common ancestor of all extant Y. pestis strains, (which likely arose — from the soil bacterium Yersinia pseudotuberculosis — between 1200 and 1340). (scientificamerican.com)
«Yersinia pestis is actually a specific mutant lineage of the bacterium Y. pseudotuberculosis, which is found in soil,» co-author Alexander Herbig of the Max Planck Institute for the Science of Human History told Seeker. (seeker.com)
The symptoms of tularemia are similar to the symptoms of other bacterial diseases such as pseudotuberculosis and plague, so a definitive diagnosis requires the bacterium to be identified by either culture or by antibody testing. (wagwalking.com)