From the comments section, Thanks jesmith! (Readers might want to look for his book, 100 Herbs of Power.)
In the 19th Century physicians such as Pasteur, Fleming, Jenner etc. became fixated with the concept of bacteria and viruses, a concept, which dominates modern medicine with its preoccupation with antibiotics, antivirals and suppressant drugs.
Claude Bernard (1813-1878) disagreed strongly with Pasteur, who laid the blame for sickness on bacteria, stating that: -“The microbe is nothing, the terrain is everything.”
Thereby reiterating the importance of the concept of homeostasis, or maintaining balance within and without the individual.
According to certain sources * Louis Pasteur, on his deathbed, conceded that Claude Bernard was right.*
Marie Nonclerq 1982
John E Smith (author of '100 Herbs of Power')