An epidemic occurs when the rate of a disease (incidence) rises above the prevalence of a disease in a certain area.
I.e. if you have 20 cases of TB reported every year for every 1000 people, it would be an epidemic if it raised to 30.
It is not a suffix in that word.
It can be, meaning a widespread outbreak of disease. It can also be an adjective meaning spreading widely or prevalent.
PandemicPandemicA PandemicA pandemic is an outbreak of disease occurring worldwide or over a large geographic area.Pandemic
There is no root word epidem. In the word epidemic, the root is demos.
Index case
epidemic
an epidemic (επι (epi)- meaning "upon or above" and δεμος (demos)- meaning "people"), occurs when new cases of a certain disease, in a given human population, and during a given period, substantially exceed what is expected based on recent experience.Epidemiologists often consider the term outbreak to be synonymous to epidemic, but the general public typically perceives outbreaks to be more local and less serious than epidemics
An epidemic in a regional area, if spread around the world it is called a pandemic.
An epidemic affection characterized by acute nasal catarrh, or by inflammation of the throat or the bronchi, and usually accompanied by fever.
It is not a real word with a real meaning.
The word 'epidemic' is a noun and an adjective. There is no verb form of the word epidemic.
The most recent epidemic in Jamaica in 2014 is the AIDS epidemic.