The document describes the entities and relationships in an EER model for a hospital management system. The entities include patients, doctors, nurses, care units, rooms, beds, illnesses, COVID tests, employees and their relationships. A patient can have multiple illnesses and travel histories. A COVID test is only for COVID patients and has a test ID and description. Relationships include doctors treating patients, nurses assigned to care units, rooms assigned to care units with beds, and patients assigned to beds.