A health worker receives a dose of the Pfizer-BioNTech vaccine against COVID-19 at a vaccination center in Santiago, on January 20, 2022. - Chile registered this Thursday a new record of daily infections, with 12,500 new infected, the highest number in the entire pandemic, in one of the countries with the highest percentage of its population vaccinated and that this Thursday began to apply the fourth dose to health personnel. (Photo by JAVIER TORRES / AFP)
A health worker receives a dose of the Pfizer-BioNTech vaccine against COVID-19 at a vaccination center in Santiago, on January 20, 2022. - Chile registered this Thursday a new record of daily infections, with 12,500 new infected, the highest number in the entire pandemic, in one of the countries with the highest percentage of its population vaccinated and that this Thursday began to apply the fourth dose to health personnel. (Photo by JAVIER TORRES / AFP)
/ JAVIER TORRES
Por Agencia EFE

Tres grandes estudios publicados este viernes por los Centros de Control y Prevención de Estados Unidos (CDC, en inglés) confirman que la mejor protección frente a la variante ómicron del coronavirus es la dosis de refuerzo de las vacunas contra el COVID-19.

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