<unk>  is a feature of infection, particularly in children. In the elderly, lymphoproliferative disorders, including chronic lymphocytic leukemia and lymphomas, often present with lymphadenopathy and a<unk> . Causes of absolute<unk>  include: * acute viral infections, such as infectious mononucleosis (glandular fever), hepatitis and Cytomegalovirus infection * other acute infections such as pertussis * some protozoal infections, such as toxoplasmosis and American trypanosomiasis (Chagas disease) * chronic intracellular bacterial infections such as tuberculosis or brucellosis * chronic lymphocytic leukemia * acute lymphoblastic leukemia * lymphoma * post-splenectomy state * CARD11-related congenital B cell<unk>  (rare, also known as BENTA disease) Causes of relative<unk>  include: * age less than 2 years; * acute viral infections; * connective tissue diseases, * thyrotoxicosis, * Addison's disease, * splenomegaly with splenic sequestration of granulocytes.
Lymphocytosis
Lymphocytopenia
Monocytosis
Leukocytosis
Cytopenia
Neutrophilia
Mastocytosis
Plasmacytosis