JAMA Netw Open:2020年和2021年加拿大成年人第一和第二波SARS-CoV-2血清阳性率评估

2022-02-20 从医路漫漫 MedSci原创

在SARS-CoV-2病毒波期间感染的发生率、与感染相关的因素以及加拿大成年人对感染的抗体反应的持久性仍然没有文献记载。

重要性:在SARS-CoV-2病毒波期间感染的发生率、与感染相关的因素以及加拿大成年人对感染的抗体反应的持久性仍然没有文献记载。

目的:通过测量成人血清阳性率,评估加拿大前两波病毒感染期间SARS-CoV-2感染的累积发生率。

设计、设置和参与者:击败冠状病毒行动研究进行了两轮关于新冠肺炎体验的在线调查,并基于参与者收集的干血点分析免疫球蛋白G水平,以评估加拿大第一波和第二波病毒期间SARS-CoV-2感染的累积发病率。从公共民调组织安格斯·里德论坛(Angus Reid Forum)的正式成员中招募了19994名加拿大成年人(年龄?18岁)作为样本。这项研究包括两个阶段(第一阶段为2020年5月1日至9月30日,第二阶段为2020年12月1日至2021年3月31日),大致对应于第一阶段(2020年4月1日至7月31日)和第二阶段(2020年10月1日至2021年3月1日)。

主要成果和措施:主要地理和人口学变量的SARS-CoV-2免疫球蛋白G血清阳性(使用化学发光法)以及与新冠肺炎症状报告的相关性。

结果:在第一阶段完成在线问卷调查的19994名成年人中,平均年龄(SD)为50.9岁(15.4岁),10522名参与者(51.9%)为女性;2948名参与者(14.5%)具有自我认同的种族和少数族裔身份,1578名参与者(8.2%)为自我认同的加拿大土著居民。在第一阶段的参与者中,8967人接受了DBS测试。在第二阶段,14621名成年人完成了在线问卷调查,其中7102人接受了DBS测试。在第一阶段完成在线调查的19994名成年人中,与加拿大总人口(45.0%)相比,受过大学或以下教育程度的人较少(4747人[33.1%])。调查受访者在其他方面代表了普通人群,包括与SARS-CoV-2感染相关的已知危险因素的流行率。未接种疫苗的成人SARS-CoV-2累计感染率从第1阶段的1.9%上升到第2阶段的6.5%。第1阶段的血清阳性模式在人口和地理上是异质性的,但在第2阶段则更为均匀(大多数地区的累积发病率在6.4%到7.0%之间)。大西洋地区是个例外,那里的累积发病率仅为3.3%(优势比[OR]对安大略省,0.46;95%CI,0.21-1.02)。在报告新冠肺炎症状的188名成年人中,共有47人(25.3%)的得分为6.15%(95%CI,2.02-18.69)。在第二阶段,444名血清阳性成人中有94人(22.2%)报告没有症状。在134名第一阶段的血清阳性成人中,在第二阶段重新测试的134人中,111人(81.8%)保持血清阳性。有糖尿病病史(OR,0.58;95%CI,0.38-0.90)的参与者在第2期出现可检测到抗体的几率较低。

图1.研究阶段1至3与加拿大2020年3月1日至2021年12月1日期间新冠肺炎确诊病例和疫苗接种的周平均值的比较

表1.加拿大第一波和第二波病毒中SARS-CoV-2的血清阳性率和第二波病毒感染的相关因素

表2.第二期血清阳性、无症状和有症状的SARS-CoV-2感染的相关因素

图2.免疫球蛋白G抗体在第一阶段和第二阶段样本收集之间的月份持久性

表3.加拿大第一波和第二波SARS-CoV-2感染、死亡和感染死亡率的年龄分布

结论:抗击冠状病毒行动研究发现,在2021年3月之前,加拿大SARS-CoV-2感染的发病率不高,而且这一发病率低于大幅减少病毒传播所需的人群免疫水平。正在进行的疫苗接种工作仍然是减少病毒传播和死亡率的核心。通过使用一系列在线调查和参与者收集的数据库,评估未来感染诱导和疫苗诱导的免疫是可行的。

原文出处: Tang X,  Sharma A,  Pasic M, et al.Assessment of SARS-CoV-2 Seropositivity During the First and Second Viral Waves in 2020 and 2021 Among Canadian Adults.JAMA Netw Open 2022 02 01;5(2)

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    2022-03-01 canlab
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    2022-03-22 feather89
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    2022-12-27 hukaixun
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    2022-02-22 zhaojie88
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    2022-02-21 carrotlyl

    放飞的北美

    0

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