A fourth dose of existing mRNA Covid-19 vaccines may have only “marginal benefits” for younger, healthy adults, according to a new Israeli study published Wednesday in the New England Journal of Medicine.
WASHINGTON, United States–
Overall, the fourth shot was found to be safe, and topped up recipients’ neutralizing antibodies — which block the coronavirus from infecting cells — to levels comparable to just after the third dose, prior to when antibody levels started waning with time. The study included only a small number of participants and was not a randomized trial — meaning its conclusions should be interpreted with caution — but the results point towards only minor benefits from the extra dose.
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