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Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates.
In chemotaxis, the neutrophils recognize chemicals that are produced by bacteria and leave the blood vessels and go into the tissues following the trail of chemicals. When they find a bacteria cell, they completely surround it and digest it (basically tear it appart with chemicals).n addition to killing bacteria by phagocytosis (engulfing), the neutrophils also can release a jumble of fibers in the form of a net called a neutrophil extracellular trap (NET). This kills microbes outside of the cell when the neutrophils release proteins in granules.