Quatre des 13 cas associés à la première éclosion de la Nouvelle -Écosse et tous les cas associés à la seconde éclosion ont déclaré n'avoir reçu qu'une dose de RRO.

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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Four of the 13 cases in the first Nova Scotia out-break and all of the cases in the second outbreak reported receiving only one dose of MMR.