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Neutropenia

Neutropenia is an indication of low levels of neutrophils in the blood. A neutrophil is a type of white blood cell that is produced in the bone marrow. White blood cells in general are important for fighting infection in the body.  Neutropenia can happen when the neutrophils are used up or destroyed faster than they are produced, or the bone marrow is not making enough neutrophils.  

Neutropenia can be caused by infection, medications like chemotherapy and cancer, among other things.  Fever and repeated infection are symptoms of neutropenia.