P1536: SARS-COV-2 INFECTIONS IN PATIENTS WITH HAEMATOLOGIC MALIGNANCIES: EFFECT OF VACCINATION AND THE DEVELOPMENT OF HYBRID IMMUNITY by Sabine Haggenburg, Tom Reuvekamp, Quincy Hofsink, Cilia R. Pothast, Romy C. Dijkland, Kayleigh van Dijk, Annoek E.C. Broers, Jaap van Doesum, Rob S. van Binnendijk, Gerco den Hartog, Michel S. Bhoekhan, Nienke J.E. Haverkate, Sandra Vogels-Nooijen, Inger S. Nijhof, Mirjam H.M. Heemskerk, Caroline E. Rutten, Abraham Goorhuis, Mette D. Hazenberg

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