The announcement comes amid worries existing vaccines could be less effective against the heavily mutated strain
Covid booster shots delivered 71% to 75% protection against getting mild Covid symptoms from the omicron variant, according to a study the U.K. Health Security Agency released Friday, amid worries existing vaccines could be less effective against the heavily mutated strain.... [+]Among those who had received two doses of the AstraZeneca vaccine, a Pfizer-BioNTech booster increased vaccine effectiveness against the omicron variant to 71.4% two weeks after it was received — that figure was 75.
5% for people whose primary doses were the Pfizer-BioNTech vaccine, according to theTwo doses of the Pfizer-BioNTech vaccine followed by a Pfizer-BioNTech booster gave 92.6% protection against the delta variant, while two doses of the AstraZeneca jab followed by the Pfizer booster yielded 93.8% protection. The study has not yet been peer reviewed and excluded mixed primary doses.The agency predicted the omicron variant would make up more than half of all Covid cases in the U.K.
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