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The deadly novel coronavirus outbreak has turned a spotlight on the science of disease, raising the question: What exactly is a pandemic?An outbreak is the occurrence of disease cases in excess of what's normally expected, according to the World Health Organization.An epidemic is more than a normal number cases of an illness, specific health-related behavior or other health-related events in a community or region.

The deadly novel coronavirus outbreak has turned a spotlight on the science of disease, raising the question: What exactly is a pandemic?
An outbreak is the occurrence of disease cases in excess of what’s normally expected, according to the World Health Organization. An epidemic is more than a normal number cases of an illness, specific health-related behavior or other health-related events in a community or region.
Coronavirus outbreak has 'pandemic potential' but it's not there yet, WHO says
The word “pandemic comes from the Greek ‘pandemos,’ which means everybody. Demos means the population. Pan meaning everyone. So ‘pandemos’ is a concept where there’s a belief that the whole world’s population will likely be exposed to this infection and potentially a proportion of them fall sick,” Dr. Mike Ryan, WHO executive director of the agency’s Health Emergencies Programme, said during a press briefing with reporters on Monday.
When it comes specifically to the novel coronavirus disease or Covid-19, “what we don’t understand yet in Covid-19 are the absolute transmission dynamics,” Ryan said.