With some diseases, even a single case amounts to an epidemic.

Question

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An epidemic refers to an unexpected increase in the number of cases of a disease above what is normally expected in that population in that area. For diseases that are extremely rare or have been eradicated in a specific region, even a single case can be considered an epidemic because it represents a significant deviation from the expected number of cases, which would be zero.

With Some Diseases, Even a Single Case Amounts to an Epidemic