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Vaccines do not work on newer coronavirus omicron sub-variants: Study
COVID-19. Since the initial highly infectious SARS-CoV-2 Omicron variant -- known as BA.1 -- of COVID-19 emerged in 2021, its new sub-variants continue to evolve. The three Omicron subvariants BA.2.12.1, BA.4, and BA.5 were discovered to significantly evade neutralising antibodies produced by both vaccination and prior infection.