Interesting - Hep A outbreaks at concerts!
"In July 2003, a cluster of hepatitis A cases was identified among young adults who had attended outdoor concert and camping events featuring various "jam bands." As of September 2, a total of 25 cases have been reported among residents of nine states (Arizona, California, Colorado, Indiana, Michigan, New York, Oregon, Tennessee, and Wisconsin). The majority of cases were among young adults who attended concerts during the spring and summer. The median age of infected persons was 23 years (range: 17--44 years); 14 (56%) were male... The bands performing at these concerts and festivals attract fans who travel from one concert to another, sometimes continuously over several months. Concerts often are multiday events involving camping on established or impromptu campgrounds, and sanitary conditions sometimes are poor... At large outdoor gatherings, crowded conditions, a lack of hand-washing facilities, and poor sanitation might contribute to the potential for disease transmission."

Interesting outbreak study by the CDC. Hep A is transmitted through the fecal-oral route. The CDC requests that young to middle-aged adults with newly diagnosed hepatitis A be asked if they have attended a "jam band" concert or any outdoor concert and associated camping event. Ok, so that may not have been the first thing i'd ask if a young adult had Hep A. And what's a "jam band" concert?