Early impact of COVID-19 vaccination on older populations in four countries of the Americas, 2021
Objective. To estimate the early impact of coronavirus disease 2019 (COVID-19) vaccination on cases in older populations in four countries (Chile, Colombia, Guatemala, and the United States of America), and on deaths in Chile and Guatemala. Methods. Data were obtained from national databases of conf...
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ftdoajarticles:oai:doaj.org/article:33135e8682d243248cfde5ea5729644d 2023-10-01T03:54:15+02:00 Early impact of COVID-19 vaccination on older populations in four countries of the Americas, 2021 Claudia Jarquin Luis Fernando Quezada Lorena Gobern Evelyn Balsells Marc Rondy 2023-08-01T00:00:00Z https://doi.org/10.26633/RPSP.2023.122 https://doaj.org/article/33135e8682d243248cfde5ea5729644d EN ES PT eng spa por Pan American Health Organization https://iris.paho.org/handle/10665.2/57865 https://doaj.org/toc/1020-4989 https://doaj.org/toc/1680-5348 1020-4989 1680-5348 doi:10.26633/RPSP.2023.122 https://doaj.org/article/33135e8682d243248cfde5ea5729644d Revista Panamericana de Salud Pública, Vol 47, Iss 122, Pp 1-9 (2023) vaccination covid-19 vaccines adults morbidity americas Medicine R Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 article 2023 ftdoajarticles https://doi.org/10.26633/RPSP.2023.122 2023-09-03T00:51:39Z Objective. To estimate the early impact of coronavirus disease 2019 (COVID-19) vaccination on cases in older populations in four countries (Chile, Colombia, Guatemala, and the United States of America), and on deaths in Chile and Guatemala. Methods. Data were obtained from national databases of confirmed COVID-19 cases and deaths and vaccinations between 1 July 2020 and 31 August 2021. In each country, pre- and post-vaccination incidence ratios were calculated for COVID-19 cases and deaths in prioritized groups (50–59, 60–69, and ≥70 years) compared with those in the reference group (<50 years). Vaccination effect was calculated as the percentage change in incidence ratios between pre- and post-vaccination periods. Results. The ratio of COVID-19 cases in those aged ≥50 years to those aged <50 years decreased significantly after vaccine implementation by 9.8% (95% CI: 9.5 to 10.1%) in Chile, 22.5% (95% CI: 22.0 to 23.1%) in Colombia, 20.8% (95% CI: 20.6 to 21.1%) in Guatemala, and 7.8% (95% CI: 7.6 to 7.9%) in the USA. Reductions in the ratio were highest in adults aged ≥70 years. The effect of vaccination on deaths, with time lags incorporated, was highest in the age group ≥70 years in both Chile and Guatemala: 14.4% (95% CI: 11.4 to 17.4%) and 37.3% (95% CI: 30.9 to 43.7%), respectively. Conclusions. COVID-19 vaccination significantly reduced morbidity in the early post-vaccination period in targeted groups. In the context of a global pandemic with limited vaccine availability, prioritization strategies are important to reduce the burden of disease in high-risk age groups. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Revista Panamericana de Salud Pública 47 1 |
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English Spanish Portuguese |
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vaccination covid-19 vaccines adults morbidity americas Medicine R Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
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vaccination covid-19 vaccines adults morbidity americas Medicine R Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 Claudia Jarquin Luis Fernando Quezada Lorena Gobern Evelyn Balsells Marc Rondy Early impact of COVID-19 vaccination on older populations in four countries of the Americas, 2021 |
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vaccination covid-19 vaccines adults morbidity americas Medicine R Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
description |
Objective. To estimate the early impact of coronavirus disease 2019 (COVID-19) vaccination on cases in older populations in four countries (Chile, Colombia, Guatemala, and the United States of America), and on deaths in Chile and Guatemala. Methods. Data were obtained from national databases of confirmed COVID-19 cases and deaths and vaccinations between 1 July 2020 and 31 August 2021. In each country, pre- and post-vaccination incidence ratios were calculated for COVID-19 cases and deaths in prioritized groups (50–59, 60–69, and ≥70 years) compared with those in the reference group (<50 years). Vaccination effect was calculated as the percentage change in incidence ratios between pre- and post-vaccination periods. Results. The ratio of COVID-19 cases in those aged ≥50 years to those aged <50 years decreased significantly after vaccine implementation by 9.8% (95% CI: 9.5 to 10.1%) in Chile, 22.5% (95% CI: 22.0 to 23.1%) in Colombia, 20.8% (95% CI: 20.6 to 21.1%) in Guatemala, and 7.8% (95% CI: 7.6 to 7.9%) in the USA. Reductions in the ratio were highest in adults aged ≥70 years. The effect of vaccination on deaths, with time lags incorporated, was highest in the age group ≥70 years in both Chile and Guatemala: 14.4% (95% CI: 11.4 to 17.4%) and 37.3% (95% CI: 30.9 to 43.7%), respectively. Conclusions. COVID-19 vaccination significantly reduced morbidity in the early post-vaccination period in targeted groups. In the context of a global pandemic with limited vaccine availability, prioritization strategies are important to reduce the burden of disease in high-risk age groups. |
format |
Article in Journal/Newspaper |
author |
Claudia Jarquin Luis Fernando Quezada Lorena Gobern Evelyn Balsells Marc Rondy |
author_facet |
Claudia Jarquin Luis Fernando Quezada Lorena Gobern Evelyn Balsells Marc Rondy |
author_sort |
Claudia Jarquin |
title |
Early impact of COVID-19 vaccination on older populations in four countries of the Americas, 2021 |
title_short |
Early impact of COVID-19 vaccination on older populations in four countries of the Americas, 2021 |
title_full |
Early impact of COVID-19 vaccination on older populations in four countries of the Americas, 2021 |
title_fullStr |
Early impact of COVID-19 vaccination on older populations in four countries of the Americas, 2021 |
title_full_unstemmed |
Early impact of COVID-19 vaccination on older populations in four countries of the Americas, 2021 |
title_sort |
early impact of covid-19 vaccination on older populations in four countries of the americas, 2021 |
publisher |
Pan American Health Organization |
publishDate |
2023 |
url |
https://doi.org/10.26633/RPSP.2023.122 https://doaj.org/article/33135e8682d243248cfde5ea5729644d |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Revista Panamericana de Salud Pública, Vol 47, Iss 122, Pp 1-9 (2023) |
op_relation |
https://iris.paho.org/handle/10665.2/57865 https://doaj.org/toc/1020-4989 https://doaj.org/toc/1680-5348 1020-4989 1680-5348 doi:10.26633/RPSP.2023.122 https://doaj.org/article/33135e8682d243248cfde5ea5729644d |
op_doi |
https://doi.org/10.26633/RPSP.2023.122 |
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Revista Panamericana de Salud Pública |
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47 |
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