Your browser doesn't support javascript.
loading
Effectiveness and duration of a second COVID-19 vaccine booster
Alejandro Jara; Cristobal Cuadrado; Eduardo A Undurraga; Christian Garcia; Manuel Najera; Maria Paz Bertoglia; Veronica Vergara; Jorge Fernandez; Heriberto Garcia; Rafael Araos.
Afiliação
  • Alejandro Jara; Pontificia Universidad Catolica de Chile
  • Cristobal Cuadrado; Ministerio de Salud Chile
  • Eduardo A Undurraga; Pontificia Universidad Catolica de Chile
  • Christian Garcia; Ministerio de Salud Chile
  • Manuel Najera; Ministerio de Salud Chile
  • Maria Paz Bertoglia; Ministerio de Salud Chile
  • Veronica Vergara; Ministerio de Salud Chile
  • Jorge Fernandez; Ministerio de Salud Chile
  • Heriberto Garcia; Ministerio de Salud Chile
  • Rafael Araos; Universidad del Desarrollo Clinica Alemana
Preprint em Inglês | medRxiv | ID: ppmedrxiv-22280660
ABSTRACT
Using a prospective national cohort of 3.75 million individuals aged 20 or older, we evaluated the effectiveness against COVID-19 related ICU admissions and death of mRNA-based second vaccine boosters for four different three-dose background regimes BNT162b2 primary series plus a homologous booster, and CoronaVac primary series plus an mRNA booster, a homologous booster, and a ChAdOx-1 booster. We estimated the vaccine effectiveness weekly from February 14 to August 15, 2022, by estimating hazard ratios of immunization over non-vaccination, accounting for relevant confounders. The overall adjusted effectiveness of a second mRNA booster shot was 88.2% (95%CI, 86.2-89.9) and 90.5% (95%CI 89.4-91.4) against ICU admissions and death, respectively. Vaccine effectiveness showed a mild decrease for all regimens and outcomes, probably associated with the introduction of BA.4 and BA.5 Omicron sub-lineages and immunity waning. The duration of effectiveness suggests that no additional boosters are needed six months following a second booster shot.
Licença
cc_by
Texto completo: Disponível Coleções: Preprints Base de dados: medRxiv Tipo de estudo: Cohort_studies / Experimental_studies / Estudo observacional / Estudo prognóstico Idioma: Inglês Ano de publicação: 2022 Tipo de documento: Preprint
Texto completo: Disponível Coleções: Preprints Base de dados: medRxiv Tipo de estudo: Cohort_studies / Experimental_studies / Estudo observacional / Estudo prognóstico Idioma: Inglês Ano de publicação: 2022 Tipo de documento: Preprint
...