'Endemic Disease' means that a disease:
Endemic refers to the constant presence of a disease or infectious agent within a given geographic area or population group without impoation from outside. Ref: Park's Textbook Of Preventive And Social Medicine By K. Park, 19th Edition, Page 88; Park's Textbook Of Preventive And Social Medicine By K. Park, 18th Edition, Page 86
Occurs clearly in excess of normal expectancy
Is constantly present in a given population group
Exhibits seasonal pattern
Is prevalent among animals