Bệnh bại liệt xuất hiện trở lại tại Venezuela sau 3 thập kỷ
Ngày 9/6, Tổ chức Y tế Liên Mỹ (PAHO) thông báo bệnh bại liệt đã xuất hiện trở lại tại Venezuela sau gần 30 năm.
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Theo TTXVN