Moderna said people who received its Covid-19 vaccine will likely need a booster shot before the winter to keep strong protection against newer variants
Moderna Inc. said Thursday it expects people who received its two-dose Covid-19 vaccine to needThe company said its vaccine remains 90% effective against preventing Covid-19 disease for at least six months, but said it sees a decline in antibody levels after six months, especially against newer strains of the coronavirus including the Delta variant. In a Phase 2 study, a third shot of the original formulation showed robust antibody responses against Covid-19 variants of concern, Moderna said.
Moderna Chief Executive Stéphane Bancel said in an interview Thursday that the company plans to seek regulatory approval for its booster shots in September, after it analyzes data from ongoing trials. He said the boosters are necessary because immunity will continue to wane over time and some vaccine recipients show a drop in neutralizing antibodies when exposed to some variants, including Delta.
“We’re playing it safe, not only for Delta but also for what’s coming after,” he said. “I don’t think the virus is done.”
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