Updated: May 17, 2021
White blood cells (WBCs) fight infections from bacteria, viruses, fungi, and other pathogens (organisms that cause infection). One important type of WBC is the neutrophil. These cells are made in the bone marrow and travel in the blood throughout the body.
About 50 to 80% of all the white bloods cells occurring in the human body are neutrophils.
The primary function of neutrophils is phagocytosis, the ingestion and destruction of microorganisms or other foreign particles. For this reason, neutrophils are classified as phagocytes. When a neutrophil is faced with a microorganism or foreign particle, phagocytosis begins.
When neutrophil count increases in the blood the causes can be bacterial infections, inflammation and physical or emotional stress.
Image of neutrophil in blood under the microscope.