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Nueva York – 28/Jun/2021
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Las vacunas de Pfizer-BioNTech y Moderna pueden brindar protección «por años» contra el covid-19, sugiere un nuevo estudio publicado este lunes en la revista Nature.
Los investigadores encontraron que las personas que recibieron cualquiera de las inyecciones de dos dosis, que utilizan la nueva tecnología de ARN mensajero (ARNm), tenían respuestas inmunes fuertes y «persistentes».Además, las vacunas de Pfizer-BioNTech y Moderna produjeron altos niveles de anticuerpos neutralizantes contra dos variantes del virus.
Esto podría significar que los receptores de Pfizer y Moderna podrían tener inmunidad duradera, durante años o potencialmente el resto de sus vidas, y es posible que ni siquiera necesiten refuerzos, según informó The New York Times.
Para el estudio, los expertos reclutaron a 14 personas que recibieron ambas dosis de la vacuna Pfizer. Entre ellos, ocho personas habían sido previamente infectadas con covid-19.El equipo tomó muestras de los ganglios linfáticos cinco veces: a las tres, cuatro, cinco, siete y 15 semanas después de la primera dosis.Los resultados mostraron que incluso cuatro meses, los receptores tenían centros germinales muy activos y la cantidad de células B de memoria que reconocían el virus no había disminuido. Aunque el estudio solo analizó a las personas vacunadas con Pfizer, Ellebedy aseguró que los hallazgos pueden aplicarse a Moderna porque ambas vacunas utilizan la misma tecnología.
El experto aclaró que no cree que la respuesta inmune de las vacunas con tecnología convencional sea tan fuerte como las elaboradas con ARNm.
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