Neutropenia is the condition of having abnormally few neutrophils present in the blood. The normal value is 1500-1800 neutrophils/microliter. Neutropenia is considered less than 1500/microliter. One of the characteristic features of neutropenia is the absence of pus. Pus is mostly made out of neutrophils, so someone who is lacking neutrophils is not going to make pus. One way of treating an individual who is suffering from neutropenia is by giving them granulocyte colony-stimulating factor (G-CSF) which stimulates the bone marrow to produce granulocytes like neutrophils.

There are several different types of neutropenia:

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