Incidence vs. Prevalence:
Incidence is the number of NEW cases of disease/injury in a population during a period of time.
Prevalence is the number of ALL cases (new and pre-existing) of disease/injury in a population during a period of time

Incidence vs. Prevalence:
Incidence is the number of NEW cases of disease/injury in a population during a period of time.
Prevalence is the number of ALL cases (new and pre-existing) of disease/injury in a population during a period of time