What are etiologies of AIHA?

Most cases unknown, minority of cases associated with other disorder include (viral infection [children], autoimmune disorders [SLE], lymphoproliferative diseases [chronic lymphocytic leukemia], disorders of immune deficiency/regulation [common variable immunodeficiency], drugs [penicillin, methyldopa], allogenic blood transfusion/ABO-incompatible hematopoietic cell transplantation