I think we should make it a cultural trend where when you are sick with something contagious like a cold or flu you were a bright yellow shirt with a hazmat symbol on it.
Cold and Flu Medicine could package the shirts with their product as advertising. You’d know to stay an extra few feet back from the guy ahead of you in line up and his shirt could say something like “He’ll be over it tomorrow thanks to Buckleys. It tasted awful but it works”
There’s no down side. Advertising good, stopping the spread of colds good, free shirt GOOD.