"The limitations of Koch’s postulates, evident in the 1800s,
are even more pronounced today."
cmr.asm.org/content/9/1/18
"is unfortunate that so many workers blindly followed the rules, because Koch himself quickly realized that in certain instances all the conditions could not be met"
ncbi.nlm.nih.gov/pmc/articles/P…
e.g. ncbi.nlm.nih.gov/pmc/articles/P… and within other considerations nejm.org/doi/full/10.10…