A community health nurse is calculating the incidence rate of new HIV diagnoses in a city. Which data are required to calculate the incidence rate?
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A
Number of new HIV cases in a specified time period divided by the at-risk population
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B
Total number of people currently living with HIV divided by the total population
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C
Number of HIV-related deaths divided by the total number of HIV cases
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D
Number of new cases divided by the total number of previously existing cases