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Las acciones de la farmacéutica sueco-británica AztraZeneca, que será producida en Argentina y envasada en México, cayeron este lunes cerca del 2% en la Bolsa de Londres, después de que la empresa anunciara que su vacuna tiene una efectividad contra la covid-19 de un 70,4 %, inferior a los porcentajes anunciados por Pfizer y Moderna.
No ha sido el arranque esperado por la compañía en el parqué londinense, cuyo índice principal, el FTSE-100, sí está experimentando una reacción positiva de los inversores, con una ligero repunte del 0.35 %.
Esta mañana la cotización de AztraZenca bajaba el 1,91%, frente a subidas más marcadas impulsadas por la noticia de la vacuna, entre la que figura la del 4,44% del grupo de aviación hispano-británico IAG, matriz de British Airways, Iberia y Vueling, entre otras.
Al hilo del anuncio de AztraZeneca, la universidad inglesa de Oxford también informó este lunes de que su vacuna también tiene una efectividad frente a la covid-19 de un 70.4 %. Estos datos contrastan con la efectividad del 95% mostrada por los preparados producidos por las compañías Pfizer y Moderna, si bien el antídoto británico es más
La universidad inglesa, junto con la farmacéutica sueco-británica, difundió hoy los resultados preliminares de la tercera fase de pruebas clínicas de su vacuna ChAdOx1 nCov-2019, que indican que previene la covid-19 en una media del 70.4 % de los casos y es segura en personas de más de 70 años, además de relativamente económica y fácil de conservar.
En uno de los experimentos, el antídoto demostró una efectividad del 90%, cuando se administró a los voluntarios una media dosis seguida de una dosis completa. Sin embargo, el nivel de eficacia bajó a un 62 % cuando se les dio dos dosis completas. Hancock se mostró “encantado” con los datos y subrayó que indican que “la vacuna, en la dosis adecuada, puede ser efectiva hasta un 90%”.
En el comunicado de la universidad de Oxford, Andrew Pollard, investigador jefe en el experimento, destaca también que uno de sus “regímenes de dosificación podría ser efectivo en aproximadamente un 90%” y, si se empleara esa pauta (media dosis más una entera), “más gente podría ser vacunada con el suministro de la vacuna planeado”.
El primer ministro británico, Boris Johnson, que hoy anunciará un sistema selectivo de restricciones contra la pandemia en el Reino Unido, celebró los avances en Twitter. “Todavía hay que hacer comprobaciones de seguridad, pero esto son fantásticos resultados”, afirmó.
Más de 20 mil voluntarios -en el Reino Unido, Brasil y Sudáfrica- participaron en la fase 3 de las pruebas clínicas organizadas por la universidad de Oxford, que ya dio buenos resultados de seguridad en la segunda fase.
El 19 de noviembre, los investigadores informaron de que la fase 2 demostraba que su vacuna es segura, con pocos efectos secundarios, en personas sanas incluso de más de 70 años y provoca una respuesta inmune en todos los grupos de edad, tanto con una dosis baja como estándar. Los científicos señalan que deben hacerse más estudios sobre la seguridad del preparado en personas con patologías previas y de diferencias procedencias
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