The study, released by the UK Health Security Agency (UKHSA), showed 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. On the other hand, a moderate to high vaccine effectiveness of 75% is seen in the early period after a booster dose.from International-News-Economic Times https://ift.tt/3DQEB38
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