Biostatistics & Research · single question
In 2000, researchers counted all existing cases of HIV in a population at a single point in time. This measure is the:
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Correct answer: B. Prevalence
- A. Incidence counts only new cases arising over a period.
- B. Correct. Prevalence is the proportion of existing (old + new) cases present at a given point or period.
- C. Attack rate is incidence during an outbreak over a short, defined period.
- D. Case-fatality rate measures deaths among those with the disease.
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