שאלה משלב א׳ בבריאות הציבור · מועד 2025, שאלה 109

Correct: C — calculating incidence rates and comparing them between exposure groups. The analytic phase of an outbreak investigation tests the hypothesis generated by the descriptive phase, and it does so by computing attack rates among those exposed and not exposed to each candidate vehicle and comparing them with risk ratios or odds ratios. Option D describes the descriptive phase, the epidemic curve and the distribution by person, place and time; option A describes the control measures that follow; and option B describes veterinary surveillance, relevant in some zoonotic investigations but not the central analytic step.