Mỹ phát triển chủng virus corona mới nhằm đẩy nhanh tiến độ thử vắcxin
Các nhà khoa học Mỹ đang phát triển một chủng mới của virus corona, có thể được dùng để tạo lây nhiễm chủ động ở các tình nguyện viên trong cái gọi là "human challenge" (HCT).
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