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Profound immune dysregulation and impaired response to the SARS‐CoV‐2 vaccine put patients with chronic lymphocytic leukemia (CLL) at risk of severe COVID‐19. We compared humoral memory and T‐cell responses after booster dose vaccination or breakthrough infection. (Green) Quantitative determination of anti‐Spike specific antibodies. Booster doses increased seroconversion rate and antibody titers in...