P1517: HUMORAL AND CELLULAR IMMUNE RESPONSES TO SARS-COV-2 NATURAL INFECTION OR VACCINATION IN PATIENTS WITH CHRONIC LYMPHOCYTIC LEUKEMIA (CLL): A STUDY BY ERIC, THE EUROPEAN RESEARCH INITIATIVE ON CLL - Alessandro Campanella; Antonella Capasso; Caterina Taccetti; Silvia Heltai; Elisa Albi; Yair Herishanu; Sabine Haggenburg; Thomas Chatzikonstantinou; Michael Doubek; Magdalena Kättström; Krzysztof Giannopoulos; Martin Simkovic; et al. (HemaSphere, 2023)