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Prevalence vs. Incidence

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Topic updated on 07/01/17 6:03pm

Overview
  • Prevalence 
    • total cases in population at given time / total population at risk
    • = Incidence * disease duration
  • Incidence
    • new cases in population over a given time period / Total population at risk during that time
      • NOTE: people who already have the disease are NOT counted among those at risk when calculating incidence  
  • Prevalence > incidence in chronic diseases
  • Prevalence = incidence in acute diseases


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Qbank (1 Questions)

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(M1.ST.81) A 4th grade class in Salem, Massachusetts has 20 students. Due to recent media coverage of the fallacious association between vaccines and autism, none of the students have been immunized against influenza this year. Fortunately, up to this point none of the students has come down with the flu. During the first week of flu season, however, 2 students contract influenza. In the second week, 3 more students contract influenza. And in the third week, 5 more students contract influenza. The other students remained healthy throughout the rest of the flu season. In this class, what was the risk of contracting influenza during the second week of the flu season? Topic Review Topic

1. 0.1
2. 0.15
3. 0.17
4. 0.25
5. 0.5

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