J&J Says A Booster Shot May Have Big Benefits : Coronavirus Updates : NPR

A nurse fills a syringe with Johnson & Johnson’s COVID-19 vaccine at a clinic in Pasadena, Calif., on Thursday.   Robyn Beck/AFP via Getty Images hide caption toggle caption   Robyn Beck/AFP via Getty Images   A nurse fills a syringe with Johnson & Johnson’s COVID-19 vaccine at a clinic in Pasadena, Calif., on Thursday….