IgA

IgA, or immunoglobulin A, comprises about 10-15 percent of the body’s total immunoglobulins and is found in external secretions . Such as saliva, tears, breast milk, and mucous, both intestinal and bronchial. They are secreted on the surface of the body as a first defense against bacteria and viral antigens. In an attempt to pre­vent them from entering the body.