1- Discuss the principles related to the occurrence and transmission of communicable and infectious diseases. 2-Describe the three focus areas in Healthy People 2020 and the objectives that apply to communicable and infectious diseases. 3-Identify and discuss nursing activities for the control of infectious diseases at primary, secondary and tertiary levels of prevention. 4-Identify and discuss a communicable and/or infectious disease that it was believed to be eradicated and have reemerged now. For example; measles.