Tiêm vaccine COVID-19 xong không sốt, có phải không hiệu quả?
Sau khi tiêm vaccine COVID-19, nhiều người gặp phải các phản ứng phụ bao gồm đau cánh tay, mệt mỏi, nhức đầu, buồn nôn và sốt… Đây là dấu hiệu cho thấy hệ thống miễn dịch đang đáp ứng với vaccine. Nhưng cũng có người không gặp bất kỳ tác dụng phụ nào cũng như không bị sốt sau tiêm vaccine. Vậy, có phải với những người này vaccine không hoạt động hiệu quả?
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