variant

Omicron BA.4/BA.5 Subvariants Drive Summer 2022 Wave

June 15, 2022 | COVID-19

Omicron subvariants BA.4 and BA.5 become dominant globally in summer 2022, demonstrating enhanced immune escape relative to earlier Omicron subvariants. Several countries see renewed hospitalizations despite high population immunity. Bivalent boosters targeting both ancestral and Omicron variants are developed.

Sources

T1 WHO Variant Tracking Official
T1 ECDC Official

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