Impact of the first vaccine dose on COVID-19 and its complications in long-term care facilities and private residences for seniors in Québec, Canada.

É. Fortin, P. De Wals, D. Talbot, M. Ouakki, G. Deceuninck, C. Sauvageau, R. Gilca, Marilou Kiely, G. De Serres
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引用次数: 2

Abstract

Background Residents of long-term care facilities (LTCFs) and private residences for seniors (PRSs) were given priority for vaccination against coronavirus disease 2019 (COVID-19). Given the shortage of vaccine in the winter of 2021, the Comité sur l'immunisation du Québec recommended postponing the administration of second doses to ensure more rapid and widespread administration of first doses. The objective of this study was to measure the impact of first-dose vaccination on 1) the incidence of cases and complications in LTCFs and PRSs and 2) the frequency of outbreaks in LTCFs. Methods In this ecological study, COVID-19 incidence and complications in residents of LTCFs and PRSs in Québec were compared with the general (community) population at a point in time when there was still only limited eligibility for vaccination. Results After vaccination in LTCFs, the incidence rate of COVID-19 decreased by 92% compared with 49% in the community, and deaths decreased by 95%. By six weeks post-vaccination, almost no facility reported five or more cases per 100 beds per week. The incidence rate decreased by 91% in PRSs compared with 2% in the community. Hospitalizations and deaths in PRSs decreased by 94% and 90%, respectively. Conclusion As a result of 1) vaccination of residents with one dose, 2) natural immunity already acquired in LTCFs and PRSs, 3) vaccination of healthcare workers and 4) other non-pharmaceutical prevention measures implemented, the circulation of the coronavirus in these settings was largely interrupted.
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加拿大魁魁省长期护理机构和私人老年人住宅中第一剂疫苗对COVID-19及其并发症的影响
长期护理机构(ltcf)和私人老年人住宅(prs)的院长优先接种2019冠状病毒病(COVID-19)疫苗。鉴于2021年冬季疫苗短缺,曲氏免疫委员会建议推迟第二剂接种,以确保更迅速和更广泛地接种第一剂疫苗。本研究的目的是衡量首次接种疫苗对:(1)ltcf和prs的病例和并发症发生率以及(2)ltcf暴发频率的影响。方法在本生态研究中,将曲梅省ltcf和prs居民的COVID-19发病率和并发症与普通(社区)人群在疫苗接种资格仍然有限的时间点进行比较。结果接种疫苗后,ltcf的COVID-19发病率下降了92%,而社区的发病率为49%,死亡率下降了95%。在接种疫苗六周后,几乎没有机构报告每100张病床每周有5例或更多病例。PRSs的发病率下降了91%,而社区的发病率为2%。减贫地区的住院率和死亡率分别下降了94%和90%。结论1)居民接种一剂疫苗,2)ltcf和PRSs已获得自然免疫,3)卫生工作者接种疫苗,4)其他非药物预防措施的实施,在这些环境中冠状病毒的传播在很大程度上被阻断。
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