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What are COVID-19 bivalent booster vaccines?

What are COVID-19 bivalent booster vaccines?

COVID-19 vaccines which target two different variants of COVID-19 are called bivalent vaccines.  Bivalent vaccines broaden immunity and therefore potentially improve protection against variants of COVID-19.  All vaccines used in the UK to date have been primarily targeted at the original strain of COVID-19 and have remained effective at preventing severe disease against subsequent variants.

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