Inmunogenicidad y reactogenicidad tras la tercera y cuarta dosis de refuerzo de una vacuna de ARNm contra la COVID-19: estudio RescueVacs
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2024
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04/07/2024
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Universidad Complutense de Madrid
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Abstract
A pesar de la velocidad sin precedentes en el desarrollo de vacunas contra la COVID-19y de los sólidos esfuerzos globales de vacunación masiva, la aparición de nuevas variantes del SARS-CoV-2 y la pérdida de inmunidad adquirida con el paso del tiempo constituyen una amenaza constante que obliga a adoptar continuamente nuevas estrategias vacunales. En el verano de 2021, se identificó una reducción sustancial en la eficacia de la vacunación en pocos meses y frente a algunas variantes. Esto llevó a las autoridades sanitarias a plantearse la necesidad de implementar una campaña de refuerzo vacunal en invierno y ala reevaluación de la eficacia vacunal contra variantes de nueva aparición, especialmente frente a aquellas consideradas variantes de preocupación. Desafortunadamente, el plazo previsto para la implementación de estos programas era menor a seis meses y aún no se disponía de información sobre el efecto de las pautas de refuerzo en población inmunocompetente, ya que hasta entonces no se habían planteado estudios al respecto y la mayoría de individuos todavía no había recibido vacunación primaria...
Despite the unprecedented speed in the development of vaccines against COVID-19 and the robust global efforts in mass vaccination, the emergence of new variants of SARS-CoV-2 and the waning of acquired immunity over time constitute a constant threat that requires the continuous adoption of new vaccination approaches and strategies. In the summer of 2021, a substantial reduction in overall vaccination efficacy after a few months and against some variants was identified. This led public health authorities to consider a third dose vaccination plan in winter and to reassess the efficacy of first generationvaccines for new variants, especially those considered as variants of concern (VoC). Unfortunately, it might be necessary to implement these booster programs in less than six months, and there was still no information on the effect of administering booster regimens to immunocompetent individuals, as no studies had been conducted until then, and the majority of the population had not yet received primary vaccination...
Despite the unprecedented speed in the development of vaccines against COVID-19 and the robust global efforts in mass vaccination, the emergence of new variants of SARS-CoV-2 and the waning of acquired immunity over time constitute a constant threat that requires the continuous adoption of new vaccination approaches and strategies. In the summer of 2021, a substantial reduction in overall vaccination efficacy after a few months and against some variants was identified. This led public health authorities to consider a third dose vaccination plan in winter and to reassess the efficacy of first generationvaccines for new variants, especially those considered as variants of concern (VoC). Unfortunately, it might be necessary to implement these booster programs in less than six months, and there was still no information on the effect of administering booster regimens to immunocompetent individuals, as no studies had been conducted until then, and the majority of the population had not yet received primary vaccination...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Medicina, leída el 04-07-2024