The immune system is the body's defense against infections. The immune system attacks germs and helps keep us healthy. How Does the Immune System Work?When the body senses foreign substances (called antigens), the immune system works to recognize the antigens and get rid of them.B lymphocytes are triggered to make antibodies (also called immunoglobulins). These proteins lock onto specific antigens. After they're made, antibodies usually stay in our bodies in case we have to fight the same germ a

How does our immune system work?