You're begging the question. How does witnessing lots of people in close proximity getting sick inform you it's a microscopic contagious pathogen causing the disease and not other environmental factors?

Idiot.... I said you start by proving CONTAGIOUSNESS.... I didn't say you start by assuming a microscopic pathogen that only lives in human cells.

You are lying through your fucking teeth when you say the flu is not contagious.

You didn't even engage with the proof I presented.

What proof?! You presented "Koch's Assumptions" and called that proof.

Then you changed the goal posts and said they couldn't get Spanish flu to spread with a citation of "trust me bro".

Well forgive me for POSTULATING that your argument about the Spanish flu will turn out to be just as stupid and hollow as your argument about Koch's Postulates.