שאלה משלב א׳ בבריאות הציבור · מועד 2025, שאלה 80

Correct: C — an attack rate in the population at risk of at least 10 per 100,000. The accepted definition of a community outbreak of meningococcal disease requires three elements together: at least three confirmed or probable cases of the same serogroup, occurring within a defined period of about three months, in people who share no close contact with one another, and yielding a primary attack rate of at least 10 per 100,000 in the population at risk — the rate criterion being decisive, since it is what determines whether mass chemoprophylaxis or vaccination of the defined population is justified. Two cases of any serogroup (option A) does not meet it; cases linked epidemiologically (option B) describe a cluster in a household or institution, handled by targeted prophylaxis; and option D sets both the case number and the time frame wrongly.

מקור: דרכי מניעה ופיקוח על מחלה מנינגוקוקית