This document discusses various common diseases including childhood diseases like measles, chickenpox, and mumps. It also mentions common infections like colds and flu. Influenza is described as a contagious disease that can range from mild to severe like pneumonia. Cancer is defined as uncontrolled cell growth that occurs in many different forms. AIDS results from HIV infection and has no cure or vaccine, spreading mainly through sexual contact or shared needles. Infectious diseases are prevented by nurses caring for patients while stopping infection spread.