A nurse prepares a shot of the Pfizer-BioNTech COVID-19 vaccine at Guy’s Hospital in London, Tuesday, Dec. 8, 2020. | Frank Augstein, Pool, The Associated Press
United States

EE.UU. autoriza la tercera dosis de Pfizer para personas mayores y de alto riesgo

Vials with Pfizer-BioNTech and Moderna coronavirus disease (COVID-19) vaccine labels are seen in this illustration picture taken March 19, 2021. | Dado Ruvic | Reuters
Science

Vacuna anticovid de Moderna supera a Pfizer, según una nueva investigación en Estados Unidos

Registered Nurse Reanne Takara administers the Pfizer COVID-19 vaccine to frontline health workers at UC Davis Medical Center on Dec. 15, 2020. Photo courtesy of UC Davis Health
World

La injusticia en la distribución de vacunas prolongará la pandemia, advierte la OMS

A sign is posted at the Johnson & Johnson campus on August 26, 2019 in Irvine, California. (Photo by Mario Tama/Getty Images)
World

Johnson & Johnson probará en septiembre en humanos una vacuna contra el COVID-19

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