Chưa có sự thay đổi về độc lực của virus sởi
Cập nhật: 14:10 24/04/2014 GMT+7
Đó là khẳng định của PGS.TS. Nguyễn Văn Kính, Chủ tịch Hội đồng chuyên môn phòng chống dịch bệnh, Bộ Y tế.
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