This document discusses three diseases that threaten public health: avian influenza, gonorrhea, and chlamydia. Avian influenza infects birds and some other animals, and can infect humans. The United States prepares for avian influenza through stockpiling vaccines and antiviral drugs. Gonorrhea and chlamydia are sexually transmitted diseases that can cause health issues if untreated. Both diseases are treated with antibiotics and prevention includes safe sex practices. Information technology helps prevent the spread of diseases by providing online information on symptoms, transmission, treatment and prevention.