Is a third SARS‐CoV‐2 vaccine dose efficient in allogeneic haematopoietic cell transplant recipients?

When and how often should allogeneic haematopoietic cell transplantation recipients be vaccinated against severe acute respiratory syndrome coronavirus‐2 (SARS‐CoV‐2) is unclear. The report by Bankova et al. suggests that a third SARS‐CoV‐2 vaccine dose is important but still insufficient in some patients to establish an adequate humoral response. Commentary on: Bankova et al. Antibody response to a third SARS‐CoV‐2 vaccine dose in recipients of an allogeneic hematopoietic cell transplantation. Br J Haematol. 2022 (Online ahead of print). doi: 10.1111/bjh.18562. xxx