At thesame treatment of B(a)P in mice 13 days later, the secondary response to SRBC measured by hema-glutination both IgM and IgG antibody titers were decreased significantlty compred to control, especi-ally IgG antibody titers.

• 在注射同样剂量的B(a)P后13天,对SRBC的二次免疫反应IgM、IgG的抗体滴度明显降低,尤以lgG抗体滴度下降最多。