I've personally gotten the 'Drupal Flu' twice, there are just so many surfaces and items that multiple people (often hundreds) touch including elevator buttons,

I've personally gotten the 'Drupal Flu' twice, there are just so many surfaces and items that multiple people (often hundreds) touch including elevator buttons, door handles, coffee carafes, stuff on vendor tables, etc. — even if you are diligent in washing hands and trying to avoid rubbing eyes, etc., it doesn't take much. It's telling that usually one or two vendors have a freebie that consists of some sample-size medication and vitamin packs.