The parasites exploit a normal process in the body whereby cells that are no longer needed or that become harmful self - destruct (apoptosis) and are swallowed up by scavenger cells called macrophages.
Parasiidid kasutavad ära keha tavalist protsessi, mille puhul makrofaagideks kutsutavad õgirakud neelavad alla vanad ja ise lammutuvad (apoptoos) rakud.