Planned Parenthood is the source for staying healthy in a world where STI's are epidemic. Keep yourself up to date with the latest information while giving your clients the knowledge they need to protect themselves. This brochure reviews the most common STI's and several that are not so common. It covers symptoms, diagnosis, transmission, effects on pregnancy and treatment. It stresses the importance of early detection, how to reduce the risk of getting STI's and what to do if you've had unsafe sex or possible exposure. 21 pages, revised December 1999.