I have definitely come home sick, but the couple years that has happened, it seemed a good portion of the show attendees were sick already and passing it around. Anywhere you have air being recycled + lots of people you are going to have a higher risk (think casinos and planes).
All you can do it take the most productive steps to avoid it. Shaking hands, handling money and gambling chips, hand rails and elevator buttons... Consider everything you come in contact with to be gross, so wash your hands whenever you can. When you can't that is what the purell is for and don't be afraid to use it. Lastly, drink lots of water and consume fruits/veggies whenever possible (vitamins help keep the immune system strong).
All that being said, there are going to be times you just can't avoid it, but you can damn sure cut your chances down.
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