There is more to modern health than new scientific discoveries, the development of new technologies, or emerging or re-emerging diseases. World events and experiences, such as the AIDS epidemic and the humanitarian emergencies in Bosnia and Rwanda, have made this evident by creating new relationships among medicine, public health, ethics, and human rights. Each domain has seeped into the other, making allies of public health and human rights, pressing the need for an ethics of public health, and revealing the rights-related responsibilities of physicians and other health care workers.