host defense

host defense

The protection an organism is afforded against infections Types 1. Nonimmunologic–eg, mucocutaneous or integumental barriers, cilia, microvilli; mechanical–eg, urinary outflow, vascular perfusion of tissues; native flora, which 'outcompete' pathogens;.2. Immunologic–eg, chemotaxis, phagocytosis, immunoglobulins, complement, T cell defense.