@arzachel Yes, there are communicable diseases, everything is communicable in our universe, it's all connected.
Haven't you seen that experiment where they isolate plants from each other, still in proximity, and they cut one leaf off from one of them, an electrochemical reaction is observed in the directly affected plant, but all other individuals start reacting as well?
Did you know that our current science does not have an explanation for that?
If flu is caused by parasites (as it is being confirmed empirically on a massive scale since last year), could it be possible that parasites communicate in ways that we don't yet understand?
https://noagendatube.com/videos/watch/ed213672-e026-4f3a-8399-c9d93cef7144web.archive.org/web/20210623164319/https://drtomcowan.com/the-smoking-gun/