monocytes; neutrophils; Each type protects your body from different kinds of infections. If your blood is low in neutrophils, you have a type of leukopenia known as neutropenia. Neutrophils are the white blood cells that protect you from fungal and bacterial infections.
For adults, counts of less than 1,500 neutrophils per microliter of blood are considered to be neutropenia. For children, the cell count indicating neutropenia varies with age. Some people have lower-than-average neutrophil counts, but not an increased risk of infection.