This document discusses several key principles of medical ethics including beneficence, nonmaleficence, autonomy, and justice. It defines beneficence as providing positive benefits and removing harm, and nonmaleficence as doing no harm and minimizing risk. Autonomy refers to a patient's right to make informed healthcare decisions. Justice means the fair distribution of healthcare resources. The document also discusses deontological ethics, which focuses on duties and rules, like not killing or stealing. In medicine, deontological ethics requires protecting individuals from harm, even during epidemics.