Booster COVID-19 shots significantly restore protection against mild disease caused by the Omicron variant, in part reversing an otherwise steep drop in vaccine effectiveness, the UK Health Security Agency said on Friday.
, vaccines provided much lower levels of protection against symptomatic infection compared with what they provide against Delta.
That compares with estimated protection against infection from Delta following a booster of around 90%. It said two UK studies which have yet to be presented publicly and three international studies suggested Omicron gave a 20 to 40-fold reduction in neutralising antibodies compared with the viruses used to develop vaccines.
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