Multiple choice

Which of the following will cause an increase in the prevalence of the disease?

  1. Immigration of healthy persons.

  2. Increased cure rate of the disease.

  3. Longer duration of the disease.

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Prevalence = Incidence × Duration. Longer disease duration increases the number of existing cases at any time. Healthy immigration dilutes prevalence, and higher cure rates reduce case accumulation.

Keep practicing — related questions