Which category of disease classification is described as having more cases than expected in a given period of time?

Question

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A disease is classified as an epidemic if there are more cases of the disease than expected in a certain area for a certain period. An outbreak is when an epidemic is confined to a local area. A pandemic is when an epidemic spreads globally. An opportunistic infection is one that has the opportunity to occur because the immune system is weakened.

Which Category of Disease Classification Is Described as Having More