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Moderna begins trial of Omicron-specific covid vaccine booster

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Omicron variant of the coronavirus. The trials will involve a total of 600 adults -- half of whom have already received two doses of Moderna's Covid-19 vaccine at least six months ago, and half of whom have received two doses plus the previously authorized booster dose.

The booster specifically targeting Omicron will therefore be evaluated as both a third and a fourth dose. The company also reported results on the efficacy against Omicron of the booster that has already been authorized.

It said that six months after the booster injection, the levels of neutralizing antibodies against Omicron were reduced by six times from the peak observed 29 days after the injection -- but remained detectable in all participants.

These data were obtained by studying the blood of 20 people who received the 50 microgram booster, half the amount of the first two injections. "We are reassured by the antibody persistence against Omicron at six months after the currently authorized" booster, Moderna chief executive Stephane Bancel said in the statement. "Nonetheless, given the long-term threat demonstrated by Omicron's immune escape, we are advancing our Omicron-specific variant vaccine booster candidate and we are pleased to begin this part of our Phase 2 study," Bancel continued.

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