Thanks for the response. I haven’t seen that line of reasoning yet. Personally, I believe it to be a bit weak. Koch was brilliant, but our understanding of the microbiome at his time was in its infancy. I think we’re figuring out just how incredibly complex our bodies and all of the different organisms which inhabit them are. Which means we need to re-examine some of our prior assumptions. Here are a few interesting articles about this. I think, like most situations, this one calls for a bit more nuance than we’re hearing.

https://pubmed.ncbi.nlm.nih.gov/29325027/

https://pubmed.ncbi.nlm.nih.gov/31440916/