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智利研究报告科兴新冠病毒灭活疫苗在儿童感染奥密克戎期间的真实世界中效果

2022-04-15 MedSci原创 MedSci原创

2022年3月15日,智利一项基于3-5岁儿童的队列研究报告发表在预印本平台Research Square上,该研究评估了在新冠病毒奥密克戎变异株流行背景下为3-5岁儿童接种中国科兴新冠病毒灭活疫苗克

2022年3月15日,智利一项基于3-5岁儿童的队列研究报告发表在预印本平台Research Square上,该研究评估了在新冠病毒奥密克戎变异株流行背景下为3-5岁儿童接种中国科兴新冠病毒灭活疫苗克尔来福在真实世界有效性。

2021年12月27日起,智利的新冠奥密克戎变异株占比超过50%,而2022年2月7日,智利的新冠奥密克戎变异株占比超过90%并有继续升高的趋势。自2021年12月6日起,智利开始为当地3至5岁儿童接种克尔来福,截至2022年3月,本次研究数据包括了智利国家医保数据库(FONASA) 覆盖的516,250 名3-5岁儿童。 在 2021 年 12 月 6 日至 2022 年 2 月 26 日期间,490,694 名儿童接种了两剂 CoronaVac,间隔 28 天,或者没有接种任何 Covid-19 疫苗。 根据 2021 年 12 月 6 日之前的 SARS-CoV-2 逆转录聚合酶链反应测定或抗原测试,我们排除了可能或确诊为 Covid-19 的儿童。对该年龄组儿童完成两剂克尔来福接种14天后的保护效果进行评估。

研究发现,完成两剂克尔来福接种490,694例的3-5岁儿童中,预防新冠病毒感染的保护效果为38.2%(95% CI,36.5–39.9),预防住院和ICU住院的保护效果分别为64.6%(95% CI,49.6–75.2)和69.0%(95% CI,18.6–88.2),截至2022年2月26日仅在未接种组中观察到2例死亡,所以未估计疫苗预防死亡的有效性。预期加强接种第3剂克尔来福后将可以获得更好的保护效果。

本次研究方法、信息化系统与前期发表在新英格兰医学杂志的成人有效性研究,以及不久前在在《柳叶刀》预印本(Preprints with The Lancet)服务器和研究平台SSRN上发表的200万6-16岁智利儿童和青少年的真实世界研究都由智利团队主导完成,并均证实了接种两剂克尔来福的有效性。其中,对6-16岁未成年人的研究显示,全程接种两剂克尔来福对6-16岁未成年人新冠感染的保护效果为74.5%(73.8-75.2);对新冠相关住院病例的保护效果为91.0%(87.8%-93.4%);对新冠相关ICU住院病例的保护效果为93.8%(87.8-93.4)。

尽管儿童及青少年感染新冠后住院、ICU住院和死亡的风险较成人及老年人低,但欧盟CDC监测数据显示12-17岁年龄组中的病例数较其他年龄组高。自2021年7月以来,12-17岁人群中的有症状病例上升,考虑到是德尔塔和奥密克戎变异株在所有年龄组中广泛传播导致。监测数据还显示,近几个月来,欧盟/欧洲经济区国家5-11岁儿童在感染病例和住院病例中所占比例不断增加,5-11岁儿童中患有基础疾病的感染新冠后住院率较健康儿童高12倍,入住ICU率约高19倍。

原始出处:

Araos R, et al.Effectiveness of CoronaVac in children 3 to 5 years during the omicron SARS-CoV-2 outbreak. Preprint from Research Square, 15 Mar 2022 DOI: 10.21203/rs.3.rs-1440357/v1 PPR: PPR468725 

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    2022-04-15 仁术2021

    不错,学习了。

    0

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    2022-04-15 weigq

    学习。

    0

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