Neutrophils, monocytes and eosinophils are phagocytic white blood cells, explains the University of Virginia. Leaukocytes, or white blood cells, are the cells of the immune system and are divided into five types: the three phagocytes along with lymphocytes and basophils. Phagocytes protect the body by engulfing and ingesting harmful foreign bodies such as bacteria.
Neutrophils account for 40 to 75 percent of all leukocytes and mainly target bacteria and fungi. Monocytes account for approximately 2 to 10 percent of all leukocytes and defend the body against viruses and bacteria. As explained by the University of Virginia, monocytes can migrate from the bloodstream to other tissues for macrophage differentiation. Eosinophils account for less than 6 percent of all white blood cells, and target parasitic invaders. Compared to neutrophils and monocytes, eosinophils display lower levels of phagocytic activity.