Moderna says its booster dose proved effective against Omicron in lab study

Moderna vaccine
(Image credit: Fred Tanneau/AFP/Getty Images)

Moderna said early Monday that a third dose of its COVID-19 vaccine significantly increased immune responses against the Omicron coronavirus variant in lab tests, adding more preliminary evidence that booster shots restore protections eroded by the new variant.

Moderna said in a press release that the half-dose it has been using as a booster increases neutralizing antibody levels 37-fold versus pre-booster levels. Neutralizing antibodies, The Wall Street Journal explains, "are among the first soldiers that the immune system deploys to battle invaders like the coronavirus." Pfizer reported earlier that its third dose boosted neutralizing antibodies against Omicron more than 25-fold.

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Peter Weber, The Week US

Peter has worked as a news and culture writer and editor at The Week since the site's launch in 2008. He covers politics, world affairs, religion and cultural currents. His journalism career began as a copy editor at a financial newswire and has included editorial positions at The New York Times Magazine, Facts on File, and Oregon State University.