P1523: IMMUNOGENICITY OF THE 13-VALENT PNEUMOCOCCAL CONJUGATED VACCINE FOLLOWED BY THE 23-VALENT POLYSACCHARIDE VACCINE IN CHRONIC LYMPHOCYTIC LEUKEMIA - Sabine Haggenburg; Hannah Garcia Garrido; Iris Kant; Hanneke van der Straaten; Fransien De Boer; Sabina Kersting; Djamila Issa; Doreen Te Raa; Hein Visser; Arnon Kater; Abraham Goorhuis; Koen De Heer (HemaSphere, 2023)