BL80355: Medical Virology II

An emerging infectious disease (EID) is defined as a disease caused by a pathogen that has not before been observed within a population or geographic location. Similarly, a reemerging infectious disease is caused by an established pathogen that appears in a new geographical location or was once controlled but begins appearing at a higher incidence. A significant number of emerging and reemerging infectious diseases are viral in nature, and they are becoming more frequent.