Mỹ cấp phép dùng vaccine cải tiến cho trẻ em từ 6 tháng tuổi
Tháng trước, một nghiên cứu cho thấy việc tiêm mũi tăng cường bằng những vaccine cải tiến giúp tăng khả năng bảo vệ trước những biến thể phụ ở những người đã tiêm bằng tới bốn mũi vaccine cũ.
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