The Public Health Nurse Is Determining the Incidence Rate of Influenza

Multiple Choice

The public health nurse is determining the incidence rate of influenza in a specific county for a period of four months. Which calculation yields correct information?

A) The number of new cases is subtracted from the population at risk.
B) The number of new cases is multiplied by the previous year's cases.
C) The number of new cases is divided by the average population at risk.
D) The number of new cases is added to previous cases and divided by two.