There is a vaccine against hepatitis A which is out there. I don't think it's widely used as of yet. People can request it. I personally don't necessarily recommend it to all my patients. It depends on their exposure likelihood.
Sanitation is an issue.
Usually you'll hear of outbreaks related to contact in a restaurant. Someone that prepares food doesn't wash their hands real well. Lots of people get sick. I think there was a media thing on that with strawberries in the LA County Schools or something last year. Whether that was really the case or not, I don't think it was 100roven.