Positive outcome ("cases") are defined as presence of sepsis within 30 hours from ED arrival, according to predefined criteria, based on an analysis of medical records from the receiving hospital. The definition of sepsis is in accordance with Sepsis-3. This outcome measure will be compared with that of the definition of severe sepsis according to the traditional criteria, i.e. based on SIRS criteria and according to the investigators´ previously developed severe sepsis criteria, adapted to emergency care.