Epidemiology: Incidence and Prevalence · USMLE Step 1

Which of the following will decrease prevalence but not incidence?

  1. More sensitive diagnostic tests
  2. Better cure rates
  3. Increased disease duration
  4. Population growth
Show answer and explanation

Correct answer: Better cure rates

Better cure rates reduce the number of existing cases but do not affect the rate of new cases. Thus prevalence decreases while incidence is unchanged.

Difficulty: Medium Question 7 of 20

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