Pfizer estudió una dosis más baja de su vacuna COVID-19 de dos inyecciones en más de 2200 niños de jardines infantiles y niños en edad escolar primaria. Los niños que hicieron parte del estudio organizado por Pfizer, después de recibir la segunda dosis, lograron desarrollar niveles de anticuerpos que combaten el coronavirus tan fuertes como...
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