Emergency Medical Technician Ethan Hall gives Mark Turney, 66, a kidney transplant patient, his Pfizer-BioNTech Covid-19 booster shot at Hartford Hospital in Hartford, Connecticut on August 24, 2021.
Joseph Prezioso | AFP | Getty Images
Six different Covid-19 vaccines are safe and effective when used as booster doses, a U.K. study has found.
The peer-reviewed phase 2 trial, published Thursday in The Lancet medical journal, looked at the safety and efficacy of seven vaccines given after two initial doses of either the Oxford-AstraZeneca or Pfizer-BioNTech vaccine.
Vaccines included in the study were those produced by Oxford-AstraZeneca, Pfizer-BioNTech, Novavax, Johnson & Johnson, Moderna, Valneva and Curevac.
The study, which involved 2,878 adults over...