Outdated "manners" you'd like to see go away

Sorry........but you crack me up! ?

Lord knows, I don’t want to give anyone bubonic plague, of all things. ?
Just giving you the oranges of how it started. I can't tell you why it has lasted 1600 years or so.

No and the filthy people during that era did not think that spread the plague. They were just blessing you so you don't die.