Synthesis of IgM was restrained after IgG was produced, because IgM antibodies were producld first in an immune response against AEV followed by a switch to IgG class.

• 当IgG出现后，IgM的合成即受到抑制。 抗AEV的血清IgM和IgG在时间上和强度上出现双峰现象，IgM和IgG的产生是同一B细胞克隆类型转换造成的。