For contagious viruses?

Has there ever been a study that proves person-to-person transmission of viruses?

In the entire history of the published medical research, there is not one so-called pathogenic disease-causing virus that has ever been found in one bodily fluid of one person. Not HIV, Ebola, Zika and SARS-CoV-2. Do you disagree with that? Present a paper proving such and explain the process fully. You’d be the first in all of mankind to do so.

Source : https://stolenhistory.net/threads/viruses-are-not-contagious.5618/