El consejero delegado de la farmacéutica Pfizer, Albert Bourla, aseguró que «probablemente» sea necesaria una tercera dosis de refuerzo de la vacuna contra el COVID-19 dentro de los 12 meses después de haber sido completamente vacunado, esto para que la inmunización sea completa.
«Es extremadamente importante suprimir el grupo de personas que pueden ser susceptibles al virus», dijo Bourla al canal de televisión CNBC en unas declaraciones difundidas este jueves, 15 de abril. El ejecutivo también indicó que estas dosis serán una herramienta importante para luchar contra las variantes del COVID-19, que han demostrado ser más contagiosas.
Hasta el momento, se desconoce durante cuánto tiempo protegen las vacunas contra el COVID-19, dado el corto recorrido de este producto.
Pfizer informó recientemente que su vacuna contra el COVID-19 tenía más de un 91 % de efectividad contra el virus y más de un 95 % contra los síntomas severos de la enfermedad, que esta protección se mantenía al menos durante seis meses después de haber recibido la primera dosis.
Asimismo, las personas que reciben la vacuna contra el COVID-19 de Moderna, cuya composición es similar a la de Pfizer, siguen mostrando altos niveles de anticuerpos seis meses después de la segunda dosis, según un estudio publicado en la revista científica The New England Journal of Medicine a principios de mes.
La farmacéutica Pfizer anunció el 26 de febrero que estudiaría la posibilidad de inyectar una tercera dosis a las personas vacunadas para intentar reforzar la protección ante las variantes más agresivas del coronavirus.
Bourla aseguró entonces que con esta tercera dosis se podría reforzar la respuesta de los anticuerpos entre 10 y 20 veces. Subrayó que al igual que la gente se vacuna anualmente contra la gripe, lo tendrá que hacer contra el COVID-19 para estar protegido.
Este nuevo estudio se dirige a dos grupos de edad, las personas de entre 65 y 85 años y las comprendidas entre 18 y 55, serán elegidas del grupo que ya participó en los primeros ensayos llevados a cabo por la farmacéutica Pfizer en cooperación con BioNTech.
La Universidad de Oxford ha iniciado un nuevo estudio clínico para determinar si se pueden combinar dosis de las vacunas y obtener una respuesta inmunológica adecuada con dos dosis independientemente del fabricante.
Los investigadores ya cuenta con la participación de la vacuna de AstraZeneca, Pfizer, Moderna y de la candidata de la estadounidense Novavax.
Por Agencia
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