An epidemic that arises from horizontal transmission and where the number of cases slowly rises and falls is said to be of what type?

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A propagated epidemic arises from person-to-person contact (horizontal transmission) and the number of cases slowly rises and falls as the infection spreads through the population. This is in contrast to a common-source outbreak, which has a sudden spike in cases and a sharp decline, and sporadic disease, which occurs only occasionally and without any clear pattern. Pandemics are worldwide epidemics, which can be of either type (common-source or propagated) and can have a rapid or slow onset.

An Epidemic That Arises from Horizontal Transmission and Where the Number