Antibodies inactivate viruses by masking their attachment sites and thus prevent them from attaching to host cells. Click here to see this . Antibodies neutralize bacterial toxins by covering their active sites. Click here to see this . Summary Let's review.
Humoral immunity is used against bacteria, bacterial toxins, and viruses in the body's fluids.
Cell-mediated Immunity Features T cells do not recognize any antigen that is not a protein. The protein must be attached to the surface of a cell such as a phagocyte. T cells do not recognize soluble proteins since they cannot bind to them. The cell-mediated system is most effective against bacteria and viruses located within phagocytic or infected host cells and against fungi, protozoans, and helminths. It is also involved in rejection of transplanted tissue.