page = covid-19 : npr

url = https://www.npr.org/tags/804916759/covid-19 analysed @ 2021-08-25 12:09 UTC

A nurse fills a syringe with Johnson & Johnson's COVID-19 vaccine at a clinic in Pasadena, Calif., on Aug. 19. Robyn Beck/AFP via Getty Images hide caption
J&J Says A Booster Shot For Its Vaccine After 6 Months May Have Big Benefits

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August 25, 2021 • Johnson & Johnson said that when it gave study participants a second jab after six months, their antibody levels were nine times higher than they were 28 days after a first dose of the COVID vaccine.