100,000 people in the US come down with drug-resistant staph infection every year. Many times more than that come down with the regular kind. There's no getting away from it. Just be sensible about cleanliness and contact with people who are sick, and don't worry about it.
Hospital-acquired staph infections are much more dangerous than those kinds that are transmitted in public. Being worried about getting staph from just walking around is a bit naive. Better focus on looking both ways when you cross the street.
This happened around our school recently, but trust me, if you demonstrate proper hygiene, you're very unlikely to get it. Just don't cut open your arms and rub them over everything you see and you'll be fine.
I contracted a staph infection last year. It was treated with antibiotics and disappeared in a week. It's scary, because I've never had one in 44 years of life, and because it was the first year working around 1,370 high school kids.
Other responders are right: be sensible about hygiene and you'll be ok.