שאלה משלב א׳ בבריאות הציבור · מועד 2026, שאלה 7

Correct: B — both incidence and prevalence will rise. Early detection in the pre-clinical phase converts people who are not yet counted as cases into diagnosed cases, so measured incidence rises as the diagnoses are pulled forward in time; and because nothing has been done to shorten the illness or hasten death, those extra cases accumulate, so prevalence — which is approximately incidence multiplied by duration — rises as well, the duration of diagnosed disease being now longer by the lead time. Option A forgets the accumulation, option C invents an effect on mortality the technology cannot have, and option D confuses the true burden of disease, which is indeed unchanged, with the measured rates, which are not.

מקור: גורדיס , עמ׳51