Part 1 (link)
Response to a comment (link)
It is important to note that I come from a science/chemistry background, which differs from biology/virology and medical “science,” I do not consider them science or science subjects. To me, science means physics and chemistry (with mathematics).
Another thing when biology books describe microorganisms (pathogens), they include viruses along with others like bacteria. This is incorrect because microorganisms exist but not viruses. Therefore, when I consider microorganisms, I include bacteria, molds, fungi, and so on, but not viruses. There is no such thing as viruses, at least scientifically.
Yes, I believe in pathogenicity and transmissibility. Note that this is a belief, not a scientific fact. That is why I wrote that appropriate scientific studies are needed to reject this belief.
My belief is that microbes cause infections commonly observed in ears, throat, eyes, gums, etc., and those infections are commonly treated with antibiotics. I do not accept that microbes are not pathogens, as some describe, but are there to help the body heal or be healthy. I do not believe that pathogens are there to strengthen tissue/body. They are not there to improve or work as hearing aids or enhance the eyes’ vision. They are infections/illnesses that must be treated and done effectively with antibiotics.
Yes, I believe in transmissibility, too. If one hugs someone coming from a mudbath, one catches mud and becomes muddy. Other routes of transmissivity are possible as well.
However, contagion is a different story. It is possible, but very difficult to study. And that is where the problem is. Contagion will only occur (or be more accurately observed) under the very specific conditions of the recipients. Usually, the contagion will not occur (observe), even if one spits directly on the face or into the mouth, because the recipient must provide the environment for the pathogen to live and grow. Usually, the recipient body would effectively neutralize it with its defense mechanisms. However, if the defense mechanism of the recipient is weak, absent, or just about right, sure enough, the illness will pass over. However, conducting scientific studies to establish contagion would be difficult/expensive and hence avoided.
So, in short, contagion exists but has not been shown or disproven experimentally. Experiments (“studies”) by spitting on the face, into the mouth, inhaling, etc., are not considered scientific because the exhaled material and the body (micro) environments are not controlled.