Causes
• Systemic inflammation results in margination and aggregation of neutrophils in vital organs, e.g. lung, liver, gut. Predominantly seen in the first 24 h after severe infection or trauma, it is often a precursor of multiple organ dysfunction
• Haemopoietic diseases, e.g. leukaemia, lymphoma, myeloma or as a consequence of chemotherapy or radiation
• Nutritional deficiencies, e.g. folate, vitamin B12, malnutrition
• Adverse drug reaction, e.g. carbimazole, sulphonamides
• Part of aplastic anaemia, e.g. idiopathic, drugs, infection
• Specific infections, e.g. brucellosis, typhoid, viral, protozoal
• Hypersplenism
• Antineutrophil antibodies, e.g. systemic lupus erythematosis
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