"There has been a steady increase in the number of cases. They asked us to help investigate the source of the outbreak. So this will be your first assignment. I want you to be involved in all aspects of the case, including investigation of the outbreak, making recommendations regarding control and prevention (including organizing IG administration if you decide it’s necessary), collection and analysis of data to determine the source, reviewing their sanitation procedures, and helping them organize training and educational to prevent future problems."

Here are some quick references on hepatitis that might be useful to you.