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The number of people with an illness at one point in time is the:

APreference
BPrevalence
CPrevention
DPrecedence
Answer & Solution
Correct answer: B. Prevalence
1. It is a snapshot of existing cases. 2. Old and new cases both count. 3. That measure is prevalence. _Source: OpenStax Microbiology, Chapter 16, Disease and Epidemiology._
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