'The Heat Clearing Class of herbs is definitely not at all a Tonic Class but a true medicinal energy and direct healing classification of herbs. This Classification of herbs (as taught in the Shanghai College Of Traditional Chinese Medicine) has 5 sub classes.
In ancient times there was certainly no microscopic knowledge of germs and not even a scientific understanding of infections. There was, however an understanding of heat (Fever) and "toxins" (What ever they were) in the blood. What is so very interesting is the discovery of actual powerful germ killing, viral destroying actions that these herbs were later proven by science to have possessed.'