COVID-19 vaccine effectiveness against the omicron (BA.2) variant in England - The Lancet

The omicron (B.1.1.529) variant, first detected in the UK on Nov 27, 2021, rapidly became the dominant strain, due in part to reduced vaccine effectiveness.1 An increase in sequenced cases of the omicron sub-lineage BA.2 was observed in the week beginning on …

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