More about righteous chi
What is the relationship between the pathogenic agent and the body’s defense mechanisms? Oriental medicine has a process in place, established over many hundreds, maybe thousands, of years that deals directly with the strengthening of the body’s good design. This is called “zhong” and is translated in our literature as "Righteous Chi."
The strength of zhong, relative to the pathogenic agent itself, determines how sick we become. With every visit by an "unwanted guest" there are those who seem to be resistant or even immune to the sickness while others succumb quite easily. It would seem that a strategy which optimizes internal strength and resilience is a good one.