S243: ANTIBODY AND T-CELL RESPONSE SIX MONTHS AFTER INITIATION OF BNT162B2 VACCINATION IN PATIENTS WITH MULTIPLE MYELOMA OR CHRONIC LYMPHATIC B-CELL LEUKEMIA COMPARED TO HEALTHY CONTROLS. (23rd June 2022) - Heftdal, L. D.; Pérez-Alós, L.; Ham, S. R.; Madsen, J. R.; Fogh, K.; Kronborg, C. C.; Vallentin, A. P.; Hasselbalch, R. B.; Ostrowski, S. R.; Frikke-Schmidt, R.; Sørensen, E.; Hilsted, L.; et al.