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Estudios muestran que la infección por Omicron en personas vacunadas «recarga» la inmunidad
Contraer la variante Omicron (de Covid-19) mientras está completamente vacunado podría aumentar su inmunidad en la medida en que puede combatir una variedad de variantes de coronavirus, según una nueva investigación. Los hallazgos se revelaron en 2 estudios estadounidenses de la Universidad de Washington y del productor de vacunas BioNTech.
Si está respaldado por datos del mundo real, esto podría ser una señal de que es poco probable que millones de personas vacunadas que contrajeron la variante Omicron se enfermen gravemente de otra variante de Covid-19 pronto.
Los estudios examinaron muestras de sangre de personas que habían tenido covid y luego recibieron 2 o 3 dosis de vacunas. También analizaron la sangre extraída de personas que habían contraído las variantes Delta y Omicron después de recibir 2 o 3 dosis de vacunas. Otros participantes estaban vacunados y reforzados pero nunca habían tenido Covid y la última categoría había contraído el virus y nunca había sido vacunada.
Los hallazgos muestran que los anticuerpos detectados en personas vacunadas que contrajeron Omicron superaron a los encontrados en las otras categorías. Los anticuerpos pueden incluso reconocer y atacar la variante Delta, que es significativamente diferente a Omicron.
Los estudios también examinaron las células B, que producen anticuerpos frescos en presencia de patógenos, y encontraron que las personas vacunadas que recibieron Omicron obtuvieron una mejor respuesta de las células B que las personas que recibieron una dosis de refuerzo pero nunca se infectaron. Faltaba la respuesta en las personas no vacunadas que habían recibido Omicron, dice David Veesler de la Universidad de Washington.
«Esto sería un problema si surgiera una nueva variante que es significativamente diferente».
Ahora se están llevando a cabo discusiones sobre la posibilidad de actualizar las vacunas para apuntar a Omicron. Según el equipo de BioNTech, puede ser mejor ofrecer a las personas un refuerzo específicamente destinado a combatir Omicron, en lugar de continuar con las vacunas originales.
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