Interpreting the Results of Trials of BCG Vaccination for Protection Against COVID-19

BCG vaccination has beneficial off-target (“nonspecific”) effects on nonmycobacterial infections. On this premise, trials set out to investigate whether BCG provides off-target protection against coronavirus disease 2019 (COVID-19). A literature search identified 11 randomized “BCG COVID-19” trials,...

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Detalles Bibliográficos
Autores principales: Noble, Christie C A, Messina, Nicole L, Pittet, Laure F, Curtis, Nigel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2023
Materias:
Review
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10640778/
https://www.ncbi.nlm.nih.gov/pubmed/37558650
http://dx.doi.org/10.1093/infdis/jiad316
Descripción
Sumario:BCG vaccination has beneficial off-target (“nonspecific”) effects on nonmycobacterial infections. On this premise, trials set out to investigate whether BCG provides off-target protection against coronavirus disease 2019 (COVID-19). A literature search identified 11 randomized “BCG COVID-19” trials, with conflicting results. These trials and the differences in their study design are discussed using the PICOT (participants, intervention, control, outcome, and timing) framework to highlight the factors that likely explain their inconsistent findings. These include participant age, sex and comorbid conditions, BCG vaccination strain and dose, outcome measure and duration of follow-up. Understanding how to control these factors to best exploit BCG's off-target effects will be important in designing future trials and intervention strategies.

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