Trung bình 1 m m88 mắc sởi có thể lây cho 12-18 m m88 khác
90% m m88 chưa có miễn dịch sẽ bị mắc bệnh nếu tiếp xúc gần với bệnh nhân sởi. Trung bình 1 m m88 mắc bệnh có thể lây cho 12-18 m m88 khác.
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