香港中文大学与公立医院合作的一项研究发现,有13名出现新冠肺炎病毒抗体的母亲,当中诞下的12名婴儿均具有抗体,显示抗体可透过胎盘传播予胎儿,但若母亲感染时病毒量高,自身抗体水平高,反而可传播予胎儿的抗体份量会减少。
中大的研究中,有20名确诊孕妇参加,她们于今年1月前产子,由确诊至怀孕相隔11周至39周,其中6人产子时仍处于感染阶段,未产生抗体,另外14人产子时已康复,故研究只计算该14名孕妇。
该14名孕妇中,其中1人因来不及制造抗体时,便已经产子,故没有抗体传播给胎儿。13名染疫后康复的孕妇诞下的婴儿中,透过脐带血检测发现12名婴儿具有抗体,相信抗体由经胎盘传给胎儿,全部婴儿的鼻咽测试结果,未验出含有新冠肺炎病毒。
研究又发现,婴儿的抗体份量可较母亲多30%,显示胎儿于母体传播抗体上很活跃,但当母亲感染时的病毒量高,自己抗体量亦高,反而传给胎儿的抗体量较少。
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