The relationship which was used to develop germ theory from the above is simply the interaction between microorganism and host.
In order words, the chain connection which establish the germ theory relationship is that microorganisms and host interact with each other.
What are microorganisms?
Microorganisms are organisms which cannot be seen with the unaided eyes. These organisms are known as pathogens when they cause diseases to plants and animals.
Generally, the germ theory of every disease states that microorganisms known as pathogens or "germs" can lead to disease or ill health conditions for both plants and animals
So therefore, the relationship which was used to develop germ theory from the above is simply the interaction between microorganism and host
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