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COVID-19 vaccine effectiveness against symptomatic infection and hospitalisation in Belgium, July 2021 to May 2022.
100-150 days after the primary vaccination course. Booster vaccination increased initial VE i to 85% (95% CI: 84-85). Against Omicron, an initial VE i of 33% (95% CI: 30-36) waned to 17% (95% CI: 15-18), ...