Biostatistics & Research · single question
2,000 cases of COVID-19 in the USA since 2020. This represents:
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Correct answer: A. Prevalence
- A. Correct. Prevalence is the total number of existing cases (new + pre-existing) over/at a given period — matching the cumulative count 'since 2020.'
- B. Incidence refers specifically to new cases occurring within a defined time period, not a cumulative total since a past date.
Note: Prevalence = total existing cases at or over a period of time. Incidence = new cases in a given time period.
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