辉瑞新冠药物Paxlovid复阳原因找到了 或激发过强免疫
文章来源: 星岛日报 于
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美国国家卫生研究院(NIH)研究发现,部分民众感染新冠病毒后,服用辉瑞(Pfizer)药物Paxlovid的话,会激发身体强大免疫反应,继而造成症状反复,因此可能解释部分人检测结果阴转阳的现象。
路透社报道,国家卫生研究院临床中心6日表示,有些患者确诊后根据指示连续5天服用Paxlovid,但身体免疫系统出现强烈反应,抗体水平也明显较高,研究人员因此深入调查,并在《临床传染病》(Clinical
Infectious Diseases)杂志上刊发了报告。
NIH以6名服用Paxlovid后复阳的患者为对象,也观察了2名没有服用Paxlovid,但一度康复后症状同样反弹的患者,并将这8人与另外6名症状没有反弹的人士互相比较。研究中的14名志愿者,全都接种了新冠疫苗和加强针,并同样感染Omicron变种病毒,在急性感染和病情反弹期间,研究人员都曾抽取他们的血液检查,从而了解其身体的免疫反应。
结果发现,所有志愿者在症状反弹前,身体状况都有显著改善,其中4人症状比起初感染时轻微,1人与初期一样严重,另1人症状则更加严重。值得注意的是,即使症状反弹,这些人士都不需额外治疗或住院。
研究人员估计,患者症状反弹可能由呼吸道残留的病毒引致,但专家同时表示,患者即使想降低症状复发的风险,也不需要听从外界建议,延长服用Paxlovid的天数。研究结果也同时证明,人体免疫系统出现强大的免疫反应,临床症状才会激烈反弹,与病毒失控复制或免疫反应受损无关。
总统拜登和白宫首席抗疫专家福西(Anthony
Fauci)服用Paxlovid后,临床症状同样曾经反弹,因此外界关注,辉瑞药物可能干扰了长期免疫反应的发展。
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