The primary cause of a disease is not germs. A disease is caused by Toxemia which results in cellular impairment and breakdown, thus paving the way for multiplication and onslaught of germs.

PLEASE be aware that germ theory as well as terrain theory and miasma theory are exactly that - theories.

Now I'm all in for challenging the paradigms that remain unquestioned, but not by introducing another theory just because we like it better.

I also encourage you to dive into Koch's postulates if you want to learn more about why germ theory is currently the predominant explanation for disease causation.