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Covid-19 vaccines showed high efficacy against severe Omicron: US data
During the period when the Delta variant was dominant, vaccine efficacy against Covid-19 hospitalisation was 90 per cent between 14-179 days after dose two of a vaccine, fell to 81 per cent more than 180 days after the second dose, and rose to 94 per cent 14 days or more after dose three.
After Omicron became dominant, the vaccine efficacy estimate against hospitalization between 14-179 days after dose two was 81 per cent, 57 per cent after more than 180 days from dose two, and 90 per cent 14 or more days after dose three.
