Những tín hiệu trái chiều trong cuộc chiến chống Covid-19
(QĐND) - Trong khi một số quốc gia tiếp tục ghi nhận số ca nhiễm mới và tử vong tăng đột biến do Covid-19, thì cuộc chiến chống đại dịch trên toàn thế giới cũng đón nhận những tín hiệu lạc quan.
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