P660: SEROLOGIC RESPONSE TO THE SECOND AND THIRD DOSE OF THE SARS-COV-2 VACCINE IN PATIENTS WITH CHRONIC LYMPHOCYTIC LEUKEMIA: RESULTS OF A PROSPECTIVE, CENTRALIZED, MULTICENTER STUDY. (23rd June 2022) - Mauro, F. R.; Giannarelli, D.; Galluzzo, C.; Visentin, A.; Frustaci, A. M.; Sportoletti, P.; Vitale, C.; Reda, G.; Gentile, M.; Levato, L.; Murru, R.; Armiento, D.; et al.