It is commonly observed that some people tend to be more prone to develop health issues like infections and allergies more commonly than others.
Also, some people tend to develop more severe symptoms of infections or other diseases while some develop very mild symptoms that often require no treatment. These variations in the incidence of diseases could be explained with the help of the Terrain Theory vs Germ Theory.
The Terrain Theory and Germ Theory try to explore the primary causes of diseases that could be responsible for disease development and progression. These theories also help us understand why some people are at a higher risk of developing diseases while some tend to be healthier throughout their life.