NO EXCESS DEATHS = NO PANDEMIC Simple as that. Medical Definition of Pandemic Medical Author: William C. Shiel Jr., MD, FACP, FACR Pandemic: An epidemic (a sudden outbreak) that becomes very widespread and affects a whole region, a continent, or the world due to a susceptible population. By definition, a true pandemic causes a high [i.e. exceptional] degree of mortality (death). https://www.medicinenet.com/script/main/art.asp?articlekey=4751