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Defend Earth from alien invaders
At this state, the disease or infectious agent exist constantly within a given geographic area or population group. It may also refer to the usual prevalence of a given disease within such an area or group.
This happens when more cases of a disease occur than expected in a given area or among a specific group of people over a particular period of time.
This happens when an epidemic occurs over a very wide area (several countries or continents) and affects a large proportion of the population.
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