重磅!新冠疫苗加强针“混打”方案启动!什么是序贯免疫?哪些人能参与?权威解读来了

2022-02-23 “院前急救联盟”公众号 “院前急救联盟”公众号

2月19日下午,国务院联防联控机制举行新闻发布会上,国家卫生健康委疾控局副局长吴良有表示,近日,经国务院联防联控机制批准,国家卫生健康委已开始部署序贯加强免疫接种。

2月19日下午,国务院联防联控机制举行新闻发布会上,国家卫生健康委疾控局副局长吴良有表示,近日,经国务院联防联控机制批准,国家卫生健康委已开始部署序贯加强免疫接种

此前,凡全程接种国药中生北京公司、北京科兴公司、国药中生武汉公司灭活疫苗或天津康希诺公司的腺病毒载体疫苗满6个月18岁以上的目标人群,可进行一剂次同源加强免疫,也就是用原疫苗进行加强。序贯加强免疫策略实施后,完成全程接种上述三种灭活疫苗的目标人群,还可以选择智飞龙科马的重组蛋白疫苗或康希诺的腺病毒载体疫苗进行序贯加强免疫。对于目标人群来说,同源加强免疫接种和序贯加强免疫选择一种即可。此外,国务院联防联控机制还批准了深圳康泰公司和医科院生物所新冠病毒灭活疫苗的同源加强免疫接种。无论是同源加强还是序贯加强,均需在完成全程接种满6个月的18岁以上人群中实施。

研究数据表明,同源加强免疫和序贯加强免疫都能够进一步提高免疫效果,希望满足接种条件的人群能够主动接种、及早接种,为健康加码、为防疫加油。

什么是序贯加强免疫?

“序贯加强免疫接种,是指采用与基础免疫不同技术路线的疫苗进行加强免疫接种。”中国疾控中心免疫规划首席专家王华庆2月19日下午在国务院联防联控机制举行新闻发布会上说到,其实,我们打脊髓灰质炎减毒活疫苗用的就是序贯加强免疫。

脊髓灰质炎减毒活疫苗,即在2月龄时注射一剂脊灰灭活疫苗(IPV),3月、4月及4岁各口服一剂脊髓灰质炎减毒活疫苗(OPV)。

新冠疫苗序贯加强免疫接种也是要完成四剂次,但需要前两个剂次用灭活疫苗,后两剂次用减毒活疫苗。

哪些人可以进行序贯免疫?

关于这次序贯免疫的对象,第一,必须是18岁以上的人群。第二,要完成2剂次的灭活疫苗接种,而且这2剂次接种的是国药中生北京公司、北京科兴公司、国药中生武汉公司的新冠病毒灭活疫苗。第三,要全程完成2剂次的接种,且接种间隔不能短于6个月。第四,没有进行过加强免疫,也就是第3针没有打。以上条件要严格把握。

序贯免疫应该怎么进行?

此前,凡全程接种国药中生北京公司、北京科兴公司、国药中生武汉公司灭活疫苗或天津康希诺公司的腺病毒载体疫苗满6个月18岁以上的目标人群,可进行一剂次同源加强免疫,也就是用原疫苗进行加强。序贯加强免疫策略实施后,完成全程接种上述三种灭活疫苗的目标人群,还可以选择智飞龙科马的重组蛋白疫苗或康希诺的腺病毒载体疫苗进行序贯加强免疫。

序贯加强疫苗效果如何?

吴良有表示,多项研究表明,无论是同源加强还是序贯加强,都对变异株都有效,而且序贯接种可获得更优的免疫效果。

2021年11月23日,复旦大学附属华山医院张文宏团队在 Cell Research 杂志发表了题为:Recombinant protein subunit vaccine booster following two-dose inactivated vaccines dramatically enhanced anti-RBD responses and neutralizing titers against SARS-CoV-2 and Variants of Concern (两剂灭活疫苗后的重组蛋白亚单位疫苗加强针,显着增强了抗RBD反应和针对新冠病毒及突变株的中和抗体滴度)的论文。

在已经接受了两针灭活病毒疫苗(科兴生物的CoronaVac疫苗或国药的BBIBP-CorV疫苗)的健康人群中,接种25μg重组蛋白亚单位疫苗的第三针加强针,第三针是在初次疫苗接种后4-8个月进行。

研究团队评估了中和抗体水平和抗RBD抗体水平,其几何平均滴度分别为18.19和24.89;并且在加强组中,总抗RBD抗体和IgG水平的中位数分别为8.47BAU/mL和 4.42BAU/mL。

在加强针接种后第14天,pVNT的水平是基线水平的75.58倍,到第28天增加到基线水平的448.60倍。

1月22日,江苏省疾病预防控制中心团队发表的一项序贯加强免疫临床试验结果表明,使用灭活疫苗进行基础免疫、用康希诺生物腺病毒载体新冠疫苗克威莎?做序贯加强,中和抗体水平为灭活疫苗同源加强的5倍。接种2剂灭活疫苗后,再接种1剂克威莎?作为加强,14天后中和抗体水平为197.4,若第3剂用灭活疫苗进行加强,抗体水平为33.6。

同源和序贯免疫可以同行进行吗?

对于目标人群来说,同源加强免疫接种和序贯加强免疫选择一种即可。吴良有表示,研究数据表明,同源加强免疫和序贯加强免疫都能够进一步提高免疫效果,希望满足接种条件的人群能够主动接种、及早接种,为健康加码、为防疫加油。

重要背景

中国批准新冠疫苗序贯加强的一个重要背景也是奥密克戎变异株正在全球范围流行,并已成为我国境外输入和本土疫情的优势毒株。相关研究普遍认为,奥密克戎变异株具有更强的感染力,同时会影响已有疫苗的保护效力,突破感染的案例也更加常见。国家卫健委今年1月发布的一篇科普文章表示,现有疫苗对奥密克戎变异株仍有一定的保护效果,但对其预防感染的能力有所下降。针对奥密克戎变异株,现有疫苗预防重症和死亡仍有效果。

长期关注新冠疫苗的医生庄时利和表示,接种新冠疫苗后,人体通过抗体和T细胞反应来对抗病毒感染,其中高水平的中和抗体是保护人体免遭病毒感染的重要基础。然而,中和抗体水平会随着时间推移而下降,并且在遇到奥密克戎这样具有较强免疫逃逸能力的变异体时会大幅下降,无法起到原有的预防作用。

相比2针灭活疫苗再加1针灭活的同源免疫加强,异源加强被认为拥有更好的效果,也是对新冠疫苗加强免疫接种策略的进一步补充和完善。一段时间以来,钟南山、高福等国内知名专家均建议开展序贯加强接种。中国疾控中心前首席流行病学专家曾光日前表示,序贯免疫可持续性较好,为2针灭活疫苗+mRNA疫苗/重组蛋白疫苗/腺病毒载体雾化吸入都是可能的选择。

中国疾控中心主任高福此前在接受媒体采访也时表示,“从免疫学基本理论来讲,疫苗接种要‘少量多次,异源接种’。‘少量多次’符合免疫学的基本原理,这也是为什么要打加强针的原因。而‘异源接种’,从理论上来讲,以A疫苗作为初级免疫,再接种B疫苗加强,比‘AA’‘BB’的接种方案效果要好。”知名临床疫苗学专家、江苏省疾控中心副主任朱凤才也提到,相比较同种类型疫苗的初免-加强策略,不同类型疫苗序贯接种可以提高免疫反应的广度、强度、持久性和功能性。

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    2022-02-24 医鸣惊人

    认真学习了

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    2022-02-24 查查佳佳

    早期小肿瘤非小细胞肺癌(NSCLC)伴有肺胸膜

    0

  4. [GetPortalCommentsPageByObjectIdResponse(id=1549781, encodeId=eb7f1549e814c, content=<a href='/topic/show?id=f7879600061' target=_blank style='color:#2F92EE;'>#重磅#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=96000, encryptionId=f7879600061, topicName=重磅)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=8e886, createdName=仁者大医, createdTime=Fri Feb 25 02:04:51 CST 2022, time=2022-02-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1197057, encodeId=5693119e0579f, content=认真学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6EF3hKja8nER8RMzxQdria9eCYFhgLTLsDOeqnvIYdeLDz5eP6EnicLuE5gibiawgno4zUA0jAR7Nbtp2llQ9fs3Mk/0, createdBy=278f1986883, createdName=医鸣惊人, createdTime=Thu Feb 24 23:26:48 CST 2022, time=2022-02-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1196698, encodeId=8bb011966983c, content=早期小肿瘤非小细胞肺癌(NSCLC)伴有肺胸膜, beContent=null, objectType=article, channel=null, level=null, likeNumber=54, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTIrrxxDxnLic8t6EAs38Qfwo6H2h6JMleIgb9OSYf6LMnVDkQEqUXWoSDWboibjhOBI9SJDTXweqQIA/132, createdBy=50aa5321359, createdName=查查佳佳, createdTime=Thu Feb 24 09:23:07 CST 2022, time=2022-02-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1196560, encodeId=3cb711965609e, content=学习了,谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=59, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7c592194322, createdName=1209e435m98(暂无昵称), createdTime=Wed Feb 23 21:24:30 CST 2022, time=2022-02-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1196532, encodeId=d71e1196532e0, content=好消息, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4d585243593, createdName=光明骑士, createdTime=Wed Feb 23 20:40:55 CST 2022, time=2022-02-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1196513, encodeId=79a01196513da, content=不错,学习了。, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20210606/e8b96fdba070433da10cd357c0646807/28bf16f46e314caaad8396c0c7df7a04.jpg, createdBy=adb15496357, createdName=仁术2021, createdTime=Wed Feb 23 19:38:17 CST 2022, time=2022-02-23, status=1, ipAttribution=)]
    2022-02-23 1209e435m98(暂无昵称)

    学习了,谢谢分享

    0

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    2022-02-23 光明骑士

    好消息

    0

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    2022-02-23 仁术2021

    不错,学习了。

    0

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