This study will be performed to determine if Panzyga (the study drug) can help with preventing infections in patients who have chronic lymphocytic leukemia (CLL). The immune system is a bodily system that protects the body from foreign substances, infection agents, cells, and tissues. When the immune system does not work properly, it´s called immunodeficiency. This can be caused by hematological malignancies (forms of cancer that begin in the cells of blood-forming tissue, such as the bone marrow, or in the cells of the immune system) like chronic lymphocytic leukemia (CLL). That´...