Causes of leukocytosis. (b)

Basophilic leukocytosis(basophilia)

Rare, often indicative of a myeloproliferative disease (e.g., chronic myelogenous leukemia)

Monocytosis

Chronic infections (e.g., tuberculosis), bacterial endocarditis, rickettsiosis and malaria;

collagen vascular diseases (e.g., systemic lupus erythematosus)

inflammatory bowel diseases (e.g., ulcerative colitis)

Lymphocytosis

Accompanies monocytosis in many disorders associated with chronic immunologic stimulation (e.g., tuberculosis, brucellosis);

viral infections (e.g.,hepatitis A, cytomegalovirus, Epstein-Barr virus);

Bordetella pertussis infection.