Johnson & Johnson coronavirus vaccine gets better boost from Moderna or Pfizer, US study shows

People who got Johnson & Johnson Inc’s Covid-19 vaccine as a first shot had a stronger immune response when boosted with vaccines from Pfizer Inc/BioNTech SE or Moderna Inc, a study run by the National Institutes of Health showed on Wednesday.The study, which is preliminary and has not been peer reviewed, is the latest challenge to J&J’s efforts to use its Covid-19 vaccine as a booster in the United States.The study, which included more than 450 adults who received initial shots from Pfizer,…


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