A child receives a dose of Pfizer's Covid-19 vaccine at an event launching school vaccinations in Los Angeles, California on November 5, 2021. - The United States can now start giving children aged 5-11 the Pfizer-BioNtech Covid vaccine, US health authorities said Tuesday in a move hailed by President Joe Biden as a "turning point" in the fight against the pandemic. (Photo by Frederic J. BROWN / AFP)
A child receives a dose of Pfizer's Covid-19 vaccine at an event launching school vaccinations in Los Angeles, California on November 5, 2021. - The United States can now start giving children aged 5-11 the Pfizer-BioNtech Covid vaccine, US health authorities said Tuesday in a move hailed by President Joe Biden as a "turning point" in the fight against the pandemic. (Photo by Frederic J. BROWN / AFP)
/ FREDERIC J. BROWN
Por Agencia Europa Press

Un estudio realizado por investigadores de Johns Hopkins Medicine, en Estados Unidos, proporciona evidencia de que los linfocitos T CD4+, células del sistema inmunológico también conocidas como células T auxiliares, producidas por personas que recibieron cualquiera de las dos vacunas disponibles de ARN mensajero (ARNm) para el COVID-19 persisten seis meses después de la vacunación en niveles solo ligeramente reducidos.

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