Multi Center Case Control Study on Multiple Risk Factors of Aplastic Anemia

Inclusion Criteria: * All the patients of AA group met a AA diagnostic criteria；The control group were chosen from other departments who were under acute infection (such as pneumonia), acute abdominal emergency (such as appendicitis), cataract surgery; * 1-65 years old, male or female; * Sign the informed consent. Exclusion Criteria: * With myelodysplastic syndrome, leukaemia, multiple myeloma,megaloblastic anaemia, paroxysmal sleep hemoglobinuria disease blood disease, etc. * History of tumor, radiation or chemotherapy, once accept the immunological therapy, autoimmune diseases or allergic disease patients; * Patients with neurological diseases.