What The Study Did: In this phase 1 study, a single immunization with Ad26.COV2.S (Janssen/Johnson & Johnson) vaccine induced rapid binding and neutralization antibody responses as well as cellular immune responses. Two phase 3 clinical trials are currently underway to determine the efficacy of the Ad26.COV2.S vaccine.
Authors: Dan H. Barouch, M.D., Ph.D., of Beth Israel Deaconess Medical Center in Boston, is the corresponding author.
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(doi:10.1001/jama.2021.3645)
Editor's Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.
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