Hospital-acquired infections is a big issue these days where you end up coming out of a hospital sicker than when you went in. One of my local hospitals does a phenomenal job with staff, visitors and patients on hand hygiene so as to prevent the spread of infections.
Truth is that the problem, while acute in the hospital setting, is not isolated to hospitals. We can acquire infections anywhere. That is why you see so many stores starting to have hand wipes available as you exit or enter, particularly supermarkets.