Yersinia pestis (Minnich's research bacterium) found in ancient human bones.

https://www.cnn.com/2024/07/10/science/plague-ancient-dna-europe-first-farmers/index.html
https://www.nature.com/articles/s41586-024-07651-2
The Nature article is open access.
There was a population decline in Europe around 5,000 years ago, and these researchers have identified Yersinia pestis (plague) bacterial DNA in the bones of ancient humans around this time period.  The authors speculate that the plague may have contributed to the population decline observed.  The population decline is based on the decline in human burials around monuments constructed by the early agricultural immigrants.
17% of the sampled populations were positive for the bacteria.  The strain of bacteria would not have been transmitted by fleas because it lacked a gene known to be required for flea transmission of the bacteria.  They speculate that the disease may have been spread human to human.  They do not know how pathogenic the strains of Y. pestis identified were.  Apparently the early farmers were not a very healthy population and their bones indicate that they had multiple issues that they were dealing with.
A hunter gatherer diet is much better than an agricultural diet, and they might not have been very good farmers.  The advantage of agriculture is that it can sustain larger populations on the same amount of land, but those populations do not have to be very healthy.
Ron Okimoto