I needed to sort these words out in my mind.
epidemic
(Med.) Common to, or affecting at the same time, a large number in a community; – applied to a disease which,spreading widely, attacks many persons at the same time; as, an epidemic disease; an epidemic catarrh, fever, etc.
See {Endemic}.
An epidemic may be restricted to one location; however, if it spreads to other countries or continents and affects a substantial number of people, it may be termed a pandemic. Wikipedia
Endemic
Belonging or native to a particular people or country; native as distinguished from introduced or naturalized; hence,regularly or ordinarily occurring in a given region; local; as, a plant endemic in Australia; – often distinguished from {exotic}.
Pandemic
Affecting a whole people or a number of countries; everywhere epidemic. – n. A pandemic disease. –Harvey.