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Baud_Olofsson t1_iu8eppd wrote

Reply to comment by theronimous in Study finds Omicron variants of the SARS-CoV-2 virus which appeared at the end of 2021 have marked genetic differences from the ancestral SARS-CoV-2. The many, distinct mutations in their infection machinery have enabled them to escape from antibodies elicited from the original series of vaccines. by MyLifeisAsaJoker

The original, not updated, mRNA vaccines are 60% effective at preventing infection with the omicron strain. And 95+% effective at preventing serious disease.

And as this linked article says about this study,

> Through their experiments, the scientists learned that vaccine boosters and hybrid immunity (acquired through a history of an infection and vaccination) both induce neutralizing antibodies in the bloodstream against Omicron BA.1, BA.2, BA.2.12.1 and BA.4/5.

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