To identify subcategories of hematology patients with A) sufficient protection against COVID-19; +28 days after completion of the standard COVID-19 vaccination schedule (responders: seroconversion); B) insufficient protection; who may benefit from boostervaccinations (low-responders: antibody response but no seroconversion) and C) insufficient protection (non-responders: no seroconversion; no antibody response).

To identify subcategories of hematology patients with A) sufficient protection against COVID-19; +28 days after completion of the standard COVID-19 vaccination schedule (responders: seroconversion); B) insufficient protection; who may benefit from boostervaccinations (low-responders: antibody response but no seroconversion) and C) insufficient protection (non-responders: no seroconversion; no antibody response).