Effectiveness of the second COVID-19 booster against Omicron: a large-scale cohort study in Chile

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dc.article.number6836
dc.catalogadorjlo
dc.contributor.authorJara Vallejos, Alejandro Antonio
dc.contributor.authorCuadrado, Cristóbal
dc.contributor.authorUndurraga Fourcade, Eduardo Andrés
dc.contributor.authorGarcía, Christian
dc.contributor.authorNájera, Manuel
dc.contributor.authorBertoglia, María Paz
dc.contributor.authorVergara, Verónica
dc.contributor.authorFernández, Jorge
dc.contributor.authorGarcía-Escorza, Heriberto
dc.contributor.authorAraos, Rafael
dc.date.accessioned2023-11-10T17:44:34Z
dc.date.available2023-11-10T17:44:34Z
dc.date.issued2023
dc.description.abstractIn light of the ongoing COVID-19 pandemic and the emergence of new SARSCoV-2 variants, understanding the effectiveness of various booster vaccination regimens is pivotal. In Chile, using a prospective national cohort of 3.75 million individuals aged 20 or older, we evaluate the effectiveness against COVID-19- related intensive care unit (ICU) admissions and death of mRNA based second vaccine boosters for four different three-dose background regimes: BNT162b2 primary series followed by a homologous booster, and CoronaVac primary series followed by an mRNA booster, a homologous booster, and a ChAdOx-1 booster. We estimate the vaccine effectiveness weekly from February 14 to August 15, 2022, by determining hazard ratios of immunization over nonvaccination, accounting for relevant confounders. The overall adjusted effectiveness of a second mRNA booster shot is 88.2% (95%CI, 86.2–89.9) against ICU admissions and 90.5% (95%CI 89.4–91.4) against death. Vaccine effectiveness shows a mild decrease for all regimens and outcomes,probably linked to the introduction of BA.4 and BA.5 Omicron sub-lineages and the waning ofimmunity. Based on our findings, individuals might not need additional boosters for at least 6 months after receiving a second mRNA booster shot in this setting.
dc.fechaingreso.objetodigital2023-10-30
dc.format.extent7 páginas
dc.fuente.origenSIPA
dc.identifier.doi10.1038/s41467-023-41942-y
dc.identifier.eissn2041-1723
dc.identifier.urihttps://doi.org/10.1038/s41467-023-41942-y
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/75282
dc.information.autorucFacultad de Matemáticas; Jara Vallejos, Alejandro Antonio; 0000-0002-2282-353X; 127927
dc.information.autorucEscuela de Gobierno; Undurraga Fourcade, Eduardo Andrés; 0000-0002-4425-1253; 12868
dc.issue.numero14
dc.language.isoen
dc.nota.accesoContenido completo
dc.pagina.final7
dc.pagina.inicio1
dc.revistaNature Communications
dc.rightsacceso abierto
dc.subjectCovid 19
dc.subjectInmunización
dc.subjectPandemia
dc.subject.ddc610
dc.subject.deweyMedicina y saludes_ES
dc.titleEffectiveness of the second COVID-19 booster against Omicron: a large-scale cohort study in Chile
dc.typeartículo
sipa.codpersvinculados127927
sipa.codpersvinculados12868
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