As far as public health issues, you could address the new immunization table that was just issued for Jan. 2006. Go to
www.cdc.gov and search immunizations. As a side issue, the supposed connection between autism and the MMR vaccine is being discussed again.
Another issue is confidentiality of reportable infectious diseases. When I was filling in for a friend in a local city health dept., part of my duties involved contacting people with one or more of these diseases and offer assistance, referrals, educational material, etc. One patient hadn't been told yet by her doctor and I ended up having to be the one to break the news to her.
Just some stray thoughts - hope they help!