Vaccine effectiveness against the Omicron variant is "significantly lower" than with the Delta variant but a booster dose raises protection against mild cases, a new study has found.
Research released on Friday by the UK Health Security Agency found that a full two-dose vaccination course was less effective against symptomatic disease with Omicron than with the original strain of COVID-19 or the Delta variant.
It found however that "moderate to high vaccine effectiveness against mild infection of
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