转阴以后多久能打第四针？哪些人要打？疫苗接种热点问答来了
<!----><style type="text/css">html{font-size:375%}</style><link href="https://pic.app.jiuquhe.com/static/publish/css/style.css?v=1605251010499" rel="stylesheet" position="1" data-qf-origin="/static/publish/css/style.css?v=1605251010499"><!-- 付费贴--> <div class="preview_article "> <!----> <p>当前，全国多地已启动新冠疫苗第二剂次“加强针”接种。随着“阳过”“阳康”人数的不断增加，哪些人群需要接种第二剂次“加强针”？“阳过”后是否能接种？记者采访了北京市疾病预防控制中心免疫预防所所长索罗丹。</p><p> </p><p><strong>问：打了“第三针”，为何还需要打“第四针”？</strong></p><p>接种新冠疫苗后，随着时间推移，疫苗产生的中和抗体水平有所下降，针对感染的保护效果下降较为明显，但在细胞免疫的作用下，仍然可以维持较高的针对重症或死亡保护效果。接种第四针后，可以在短时间内激活免疫系统，重获针对新冠病毒变异毒株的高水平中和抗体，进一步提升接种人群的预防感染、重症和死亡的保护效果，更好地提升保护能力。</p><p> </p><p><strong>问：阳性期间可以接种疫苗吗？阳过多久后才能接种？</strong></p><p>阳性期间无需接种疫苗，因为疫苗的作用是预防疾病，并无治疗的效用。按照国家现行的新冠疫苗使用技术指南，新冠病毒阳性感染后6个月内罕见再次感染发病的情况。既往新冠肺炎病毒感染者，包括患者或无症状感染者，在充分告知基础上，可在6个月后接种1剂。</p><p> </p><p><strong>问：第二剂次“加强针”可以接种哪些疫苗？国家优先推荐哪些组合？</strong></p><p>根据国家方案，所有批准附条件上市或紧急使用的疫苗均可用于第二剂次加强免疫，优先考虑序贯加强免疫接种，或采用含奥密克戎毒株或对奥密克戎毒株具有良好交叉免疫的疫苗进行第二剂次加强免疫接种。</p><p> </p><p>序贯加强免疫，是指采用不同技术路线的疫苗进行异源加强免疫。既往研究发现，采用不同技术路线的疫苗进行异源加强免疫，能够获得比同源加强免疫更高水平的中和抗体。</p><p> </p><p>目前，我国已经获批纳入紧急使用或附条件上市的新冠病毒疫苗有灭活疫苗、重组蛋白疫苗、腺病毒载体疫苗和流感病毒载体疫苗四种类型。从大的原则上来说，只要与前面接种剂次接种的疫苗类型不同，就符合序贯免疫的范畴。考虑到我们国家前期大人群接种过程中绝大部分受种者都使用三剂次灭活疫苗完成了接种的实际情况，在第二剂次加强免疫时，可以选择重组蛋白疫苗、腺病毒载体疫苗或流感病毒载体疫苗中的任一种，这也是国家列举推荐的接种组合。</p><p> </p><p><strong>问：为何推荐老年人接种第二剂次“加强针”？</strong></p><p>老年人是感染新冠病毒出现重症死亡的高风险人群，也是感染病毒后发生重症死亡的主要人群。无论是国外的数据，还是我们国家香港地区的数据，都显示老年人接种完加强针后，可以显著降低病死率，接种第二剂次加强针后，病死率可以进一步降低。通过接种第二剂次加强针，可以让老年人在较快时间内提升抗体水平，更好提升保护能力。</p><p><strong>一组图了解当前疫苗接种10大热点问答。</strong></p><p> </p><p class="empty_paragraph"> </p><p class="qf_image big noneditable" contenteditable="false"><img src="https://pic.app.jiuquhe.com/forum/20221223215650front1_0_252801_FlLCr-avdASTBQa0b7u9kjcwdCCA.jpg?watermark/1/image/aHR0cDovL3BpYy5hcHAuaml1cXVoZS5jb20vd2F0ZXJfaW1nXzIwMjAxMjA3XzQzOC5qcGc=/dissolve/100/gravity/SouthWest" alt="" width="861" height="924" 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src="https://pic.app.jiuquhe.com/forum/20221223215650front1_0_252801_Fg10ajtcASTst7e8toVgz4sAuntl.jpg?watermark/1/image/aHR0cDovL3BpYy5hcHAuaml1cXVoZS5jb20vd2F0ZXJfaW1nXzIwMjAxMjA3XzQzOC5qcGc=/dissolve/100/gravity/SouthWest" alt="" width="861" height="1077" data-qf-origin="forum/20221223215650front1_0_252801_Fg10ajtcASTst7e8toVgz4sAuntl.jpg?watermark/1/image/aHR0cDovL3BpYy5hcHAuaml1cXVoZS5jb20vd2F0ZXJfaW1nXzIwMjAxMjA3XzQzOC5qcGc=/dissolve/100/gravity/SouthWest" /></p><p class="empty_paragraph"> </p><p class="qf_image big noneditable" contenteditable="false"><img src="https://pic.app.jiuquhe.com/forum/20221223215759front1_0_252801_FlIMPa10VbIy41YRix9aiXeVrrFB.jpg?watermark/1/image/aHR0cDovL3BpYy5hcHAuaml1cXVoZS5jb20vd2F0ZXJfaW1nXzIwMjAxMjA3XzQzOC5qcGc=/dissolve/100/gravity/SouthWest" alt="" width="861" height="1146" data-qf-origin="forum/20221223215759front1_0_252801_FlIMPa10VbIy41YRix9aiXeVrrFB.jpg?watermark/1/image/aHR0cDovL3BpYy5hcHAuaml1cXVoZS5jb20vd2F0ZXJfaW1nXzIwMjAxMjA3XzQzOC5qcGc=/dissolve/100/gravity/SouthWest" /></p><p class="">来源：川观新闻</p> <!----></div> 了解一下 谢谢分享哦 大家都注意身体健康 如果有用还是可以的 按规定接种第四针。 知道了哟 后面好了去接种 感谢分享，给你点赞！下次有这样的好内容，记得分享哦~ 说的半年以后
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