Pandemics are a spread of disease covering

An extensive geographical area

Explanation:

A pandemic, a word that comes from the Greek pandêmon nosêma, from παν (pan = all) + δήμος (demos = people) + nosêma (= disease), expression that means sickness of a whole people is the affectation of an infectious disease of humans throughout a geographically extensive area.

In May 2009, WHO changed the definition of a pandemic. Before this change, "Pandemic" was defined as: "Infection by an infectious agent, simultaneous in different countries, with a significant mortality in relation to the proportion of the infected population". In the new definition of "pandemic" the characteristic of "mortality" has been eliminated.

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