抗体的亲和力(Ａｆｆｉｎｉｔｙ)　表示抗原与抗体结合的强度,通常是讨论抗体的一个结合部位与一个抗原决定簇之间相互作用的强度。亲和力大,抗原、抗体结合的强度大,抗原抗体复合物稳定。然而,一个抗体分子的作用部位是多价的,ＩｇＧ分子的作用部位有2个,ＩｇＭ分子的作用部位 The Affinity of an antibody indicates the strength of the antigen binding to an antibody and is usually the intensity of the interaction between one binding site of an antibody and one antigenic determinant. Affinity, antigen, antibody binding strength, antigen-antibody complex stability. However, the site of action of an antibody molecule is multivalent, with two sites of action of IgG molecules, the site of action of IgM molecules