La Administración de Alimentos y Medicamentos (FDA) de EEUU autorizó el 3 de enero el uso de una tercera dosis de la vacuna contra el COVID-19 de Pfizer/BioNTech para niños de entre 12 y 15 años.
A la vez, redujo el tiempo de todas las inmunizaciones de refuerzo a 5 meses desde los 6 meses posteriores al fin del programa de vacunación inicial y autorizó una tercera dosis en niños de 5 a 11 años que estén inmunodeprimidos.
La FDA tomó la decisión tras revisar los datos publicados y las pruebas en el mundo real sobre la seguridad de las dosis de refuerzo proporcionadas por el Ministerio de Salud israelí, incluidos los datos de más de 6.300 personas de 12 a 15 años de edad que recibieron una vacuna de Pfizer.
Las pruebas de laboratorio demostraron que dos dosis de las vacunas de Pfizer-BioNTech y Moderna generan una baja respuesta inmunitaria contra ómicron, mientras que las dosis de refuerzo parecen ser protectoras contra la nueva variante.
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