• AFP-JIJI

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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.

The research assessed 270 health care workers at the Sheba Medical Center in Tel Aviv who received a second booster shot of either the Pfizer or Moderna vaccines, four months after initially getting three Pfizer shots.

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